If your goal is specifically “Heroku for developers, but running on our existing Kubernetes cluster,” I would not start with Backstage. I’d evaluate Humanitec first, with Port as the strongest alternative.

The important distinction is that an IDP has two layers: the developer experience (catalog, UI, templates) and the execution/orchestration layer that actually turns “deploy my app” into Kubernetes resources, environments, secrets, databases, etc. Backstage is excellent at the former but is fundamentally a framework/portal; it doesn't itself provide the PaaS-like deployment layer.

My shortlist

1. Humanitec — my default recommendation

Humanitec is the one I'd investigate first if you're building a company-wide Kubernetes PaaS.

Its Platform Orchestrator is specifically designed to sit between developer intent and infrastructure: developers request an application/environment, while the platform team defines how that intent becomes the appropriate Kubernetes/cloud resources. Humanitec also has a Portal sitting on top of the orchestrator for self-service environments and deployments.

That maps nicely to:

Developer: “Create a Go service called payments and give me dev/staging/prod.” rather than:

“Here's a Helm chart, values.yaml, ArgoCD application, namespace, ingress, secrets, resource limits…” The big advantage is that you can make the platform contract stable while changing the underlying implementation.

2. Port — probably the best developer-facing experience

Port would be my second choice, particularly if your priority is getting something developers love quickly.

Port has a flexible catalog and low-code/self-service “blueprints,” so you can build workflows like:

• Create service
• Create environment
• Deploy
• Roll back
• Create database
• Generate preview environment
• Promote staging → production

It's particularly attractive if you don't want to spend months building a Backstage application and maintaining plugins. Current comparisons also distinguish Port as a portal/self-service layer versus Humanitec as the deeper orchestration layer.

The catch: for a truly Heroku-like platform, you'll still need to think carefully about the deployment engine underneath Port.

3. Backstage — great if you want to build the product yourself

Backstage is excellent, especially if you have a substantial platform engineering team.

It gives you the catalog, software templates/scaffolder, documentation, plugins, and Kubernetes visibility. Its Kubernetes integration can show service owners deployments, pods, and other Kubernetes resources directly in the service catalog.

But there's a critical trap:

Backstage isn't Heroku.

You'd need to build the machinery behind the buttons:

Backstage
   │
   ├── "Create service"
   │       ↓
   │    Git repo
   │       ↓
   │    CI/CD
   │       ↓
   │    Image
   │       ↓
   │    Helm / Kustomize / ArgoCD
   │       ↓
   │    Kubernetes
   │
   └── "Create database"
           ↓
        Terraform / Crossplane / operator
           ↓
        Database

That's a perfectly good architecture—but you're now building a PaaS.

And that's why I'd avoid choosing Backstage simply because it's the most recognizable IDP name.

What I'd actually build

For your stated goal, I'd aim for this architecture:

                 ┌─────────────────────┐
                 │      Developers      │
                 └──────────┬──────────┘
                            │
                    "Deploy my service"
                            │
                            ▼
                 ┌─────────────────────┐
                 │   Developer Portal  │
                 │   Humanitec / Port  │
                 └──────────┬──────────┘
                            │
                     Platform API
                            │
                            ▼
                 ┌─────────────────────┐
                 │  Platform Control   │
                 │       Plane         │
                 │                     │
                 │  policies           │
                 │  environments       │
                 │  resource bindings  │
                 │  deployment config   │
                 └──────────┬──────────┘
                            │
                ┌───────────┼───────────┐
                ▼           ▼           ▼
             Git/CI      Registry    Secrets
                │
                └───────────┬───────────┘
                            ▼
                 ┌─────────────────────┐
                 │     Kubernetes      │
                 │                     │
                 │ namespaces          │
                 │ deployments         │
                 │ services            │
                 │ ingress             │
                 │ autoscaling         │
                 └─────────────────────┘

The key is that developers shouldn't know Kubernetes exists.

Your platform should expose a much smaller abstraction:

service:
  name: payments
  runtime: go

environment:
  name: production

resources:
  cpu: 500m
  memory: 1Gi

database:
  type: postgres

And the platform turns that into whatever your Kubernetes implementation requires.

The “Heroku test”

I'd evaluate each candidate by giving it this exact requirement:

A developer creates a new service from GitHub, chooses Go, clicks Create, gets a dev environment, pushes code, gets an automatic deployment, receives a URL, can create a Postgres database, can create a preview environment from a PR, and can promote the exact artifact to production—without knowing Kubernetes, Helm, ArgoCD, Terraform, or cloud credentials exist. Then measure:

• Time to first deployment
• Number of Kubernetes concepts exposed to developers
• Number of tickets required
• Time for the platform team to add a new golden path
• How easy it is to enforce security/resource policies
• Can developers use Git/CLI/API instead of only a web UI?
• Can the platform team evolve the implementation without changing the developer contract?

That last one is particularly important. A good IDP lets you change, say, Helm → Kustomize → another deployment mechanism without developers noticing.

My recommendation

I'd narrow it to:

If you have a dedicated platform team and want the strongest long-term internal PaaS: → Humanitec

If you want the fastest path to a polished self-service developer portal: → Port

If you have a strong platform engineering team and want maximum control/open source: → Backstage + your own orchestration layer

If your primary goal is “give me Heroku on our Kubernetes cluster with minimal platform engineering”: → Also evaluate Qovery very seriously. It specifically targets self-service deployment onto existing Kubernetes/cloud infrastructure, making it closer to the PaaS experience you're describing than portal-only products.

If I were starting this project today, I'd prototype Humanitec vs Qovery vs Port with one golden path rather than doing a broad IDP bake-off. The winner should be the one that lets a developer go from git push → running production service with the least Kubernetes knowledge and the least custom platform code.

What I'd actually build

For your stated goal, I'd aim for this architecture:

                 ┌─────────────────────┐
                 │      Developers      │
                 └──────────┬──────────┘
                            │
                    "Deploy my service"
                            │
                            ▼
                 ┌─────────────────────┐
                 │   Developer Portal  │
                 │   Humanitec / Port  │
                 └──────────┬──────────┘
                            │
                     Platform API
                            │
                            ▼
                 ┌─────────────────────┐
                 │  Platform Control   │
                 │       Plane         │
                 │                     │
                 │  policies           │
                 │  environments       │
                 │  resource bindings  │
                 │  deployment config   │
                 └──────────┬──────────┘
                            │
                ┌───────────┼───────────┐
                ▼           ▼           ▼
             Git/CI      Registry    Secrets
                │
                └───────────┬───────────┘
                            ▼
                 ┌─────────────────────┐
                 │     Kubernetes      │
                 │                     │
                 │ namespaces          │
                 │ deployments         │
                 │ services            │
                 │ ingress             │
                 │ autoscaling         │
                 └─────────────────────┘

The key is that developers shouldn't know Kubernetes exists.

Your platform should expose a much smaller abstraction:

service:
  name: payments
  runtime: go

environment:
  name: production

resources:
  cpu: 500m
  memory: 1Gi

database:
  type: postgres

And the platform turns that into whatever your Kubernetes implementation requires.

The “Heroku test”

I'd evaluate each candidate by giving it this exact requirement:

A developer creates a new service from GitHub, chooses Go, clicks Create, gets a dev environment, pushes code, gets an automatic deployment, receives a URL, can create a Postgres database, can create a preview environment from a PR, and can promote the exact artifact to production—without knowing Kubernetes, Helm, ArgoCD, Terraform, or cloud credentials exist. Then measure:

• Time to first deployment
• Number of Kubernetes concepts exposed to developers
• Number of tickets required
• Time for the platform team to add a new golden path
• How easy it is to enforce security/resource policies
• Can developers use Git/CLI/API instead of only a web UI?
• Can the platform team evolve the implementation without changing the developer contract?

That last one is particularly important. A good IDP lets you change, say, Helm → Kustomize → another deployment mechanism without developers noticing.

My recommendation

I'd narrow it to:

If you have a dedicated platform team and want the strongest long-term internal PaaS: → Humanitec

If you want the fastest path to a polished self-service developer portal: → Port

If you have a strong platform engineering team and want maximum control/open source: → Backstage + your own orchestration layer

If your primary goal is “give me Heroku on our Kubernetes cluster with minimal platform engineering”: → Also evaluate Qovery very seriously. It specifically targets self-service deployment onto existing Kubernetes/cloud infrastructure, making it closer to the PaaS experience you're describing than portal-only products.

To replicate a true Heroku-like experience (git push/pr-based, zero-K8s-knowledge-required deployments, automatic routing, and managed backing services) directly on top of your existing Kubernetes cluster, you need a self-service Internal Developer Platform (IDP) rather than just a generic developer portal.

While tools like Spotify's Backstage are great for a centralized service catalog, they require an immense amount of custom scaffolding and glue-code plugins to actually achieve a Heroku-style deployment engine.

The top-tier IDPs designed specifically to turn a Kubernetes cluster into a turnkey PaaS include:

- **The Vibe:** The enterprise standard for true architectural abstraction.
- **How it works:** Platform engineers define a "Score" workload specification, and Humanitec dynamically provisions environments and resources on your Kubernetes cluster. Developers get a clean UI, CLI, and PR-based workflow that feels entirely decoupled from raw Kubernetes manifests.
- **Best for:** Large engineering organizations that want strict guardrails and deep customization over how infrastructure is provisioned.[[1]](https://google.com/goto?url=CAEScAHrOzAVWl18AU7lr8-4IJhMypoDD4Hde9Bv3s5fYEPxTZru6l-BG0eninr_teuM0vrFyEqqa-TuaDEDZQVBDJioKA0zjgdGIzXGT0AURzi64nWnjI527FOkJvtQAnufxl0ligsz2psbE9FdlOJyUjE)[[2]](https://google.com/goto?url=CAESSwHrOzAVI5YdSWAb_1W8VrVeqXpEAVKyPnSQLbwIZsYeplUnUJuIPe7ptw71lMnk5r3RmSNekdl0nSTu_mpef7zI0uE9zQ5fSKGLAw)[[3]](https://google.com/goto?url=CAESZQHrOzAVOGPMgkRAjC8uoeC7ns_voPWahZ__q-XOBNu6jLAaW06GlzqmPUu0ejxmX3sPGelBQKnUpYwo1kSvZ9bwRMH8Tng9OM2OnfHHdIppDGXdi6nMFhmNfFnWIyYz2mrSmK3o)[[4]](https://google.com/goto?url=CAESdQHrOzAVOmsPnkiX19P8stzgB8A6tKifCO_Vsm5tHBqVRO7Srvnk166pwfyb0Qx_oiEi-x6qK6iUzg_JhEsZD_EDx6kjGhRaBLMd0uj8gzjbWQV0JEbmU39waYfngvV-u2MX-3rj4xTm6qVTJDOYvk2yPh-G1g)[[5]](https://google.com/goto?url=CAESTgHrOzAVkCMl_VFaKKHujl8sIt94HACEJKZ7oIpeNuoWUtt-_8NjPs9qiIElgVHnxqrSsDq_QeSI3RMntMGYEB5R-egKZa0_lEwjcmSW1A)

- **The Vibe:** The closest 1:1 drop-in replacement for Heroku on your own cloud/Kubernetes.
- **How it works:** It connects directly to your AWS, GCP, or Azure Kubernetes cluster (EKS, GKE, AKS) and provides an out-of-the-box Heroku/Render-style interface. It handles automated previews, logs, rollbacks, and environment variables seamlessly.
- **Best for:** Teams that want a gorgeous, highly polished PaaS interface up and running in days without building custom abstraction layers.[[1]](https://docs.cloud.google.com/kubernetes-engine/enterprise/docs/deployment-options)[[2]](https://google.com/goto?url=CAESXgHrOzAV-G6Xya-kCjtiaz0WKRWbGrmQsOF3TxihzoqOp1dReJF_Sn6CkUCx1YnOqOjwicMlkm9z1ra74vDPSbgXMClOsdLy5CV_0smpiD7WaM2DtjuRA7He6_LaGIw)[[3]](https://google.com/goto?url=CAESYQHrOzAV6yY99k-3UEWesPFPxhVOmazNi_YNfmAXKlErEr945LGndRC8pYp16H5iPQJm3yneM7QRF5dipru4QAZnQ3-dIA2u2venbDExz8Fy-wjzC-oBf_0tSXoP38oaJqU)[[4]](https://google.com/goto?url=CAESUgHrOzAVwmigieO8fYUf_usxwV-9x7MTWDsB-pN9etW6GsHCN7YwCkevFE-Zz4_cvSGK2lCUPufnJ8LAo8pj2h98-rOgXhwl8r9FEX4oaXsux-k)[[5]](https://google.com/goto?url=CAESbAHrOzAVmgbpPcWhbnTs6-nx5E71bW2W1O0Z4mf3DWjHgormiN8ZZko9TUYQzkfg5dYBoQ4NZQxEb4JouC3ZzYjno8u26gTIkz1iOxOIiCRMLeZNJCIvcnOjmzM_ZbkQBB9MNlM5VyB88m8PnA)

- **The Vibe:** Highly customizable, graph-based developer portal with strong self-service actions.
- **How it works:** Port excels at modeling your software catalog and tying custom "Actions" (like "Create new microservice") directly to backend automations (GitHub Actions or Argo Workflows) that target your Kubernetes cluster.
- **Best for:** Teams that want a tailored UI/UX and already have robust CI/CD pipelines they want to orchestrate.[[1]](https://google.com/goto?url=CAESewHrOzAVbu93RqnXYE2Q0ukz-07unBNJGZOdPBRQbO_TxnZ2A9j7aUYqZnPQM3aAmK0gxdh_Bub6uFbawPQTyaAf-iVkAwLOUaDvkjcU9v53vzVE-50egeI2SgDJnYADOKZ6aZPvTCtXrhTibBQJmGtNzjxzBaTVFWUwMw)[[2]](https://google.com/goto?url=CAEScQHrOzAV8Vhrz2tUejs5ynuf_X9DjcxgfTRiy6nfTMRzgCCYZG7ZA_S3pm06Cx39qI_d8jp3zMvvrvIgbuJNU1-I1mZ1UVQPctpZrKaUMfzeGhZCFQVvtygImwedjFuUzPpdnxlgXoftwDjmAhw5-SOC)[[3]](https://google.com/goto?url=CAESfwHrOzAV022QqKYkE92TMcYcb8CFkSPKRSAisZ-0QAnUlLyaxtNaAJig_M-5ySZeRRQWWkVxCipFkscy-f86GoW4-uE5Slb5iXqyEsJIWEd3vpewC7MuNmeWEEDARtkr11kQE3L6HK3AxEPXiEsG3WsOTLizl9bQKGA24L_2Dqc)

- **The Vibe:** The DIY, CNCF-aligned open-source assembly line.
- **How it works:** Combining Crossplane (for infrastructure/addon provisioning) with ArgoCD (for GitOps delivery) and an abstraction layer like Kratix.
- **Best for:** Organizations with dedicated platform engineering capacity who want zero commercial licensing fees and total ownership over the underlying open-source stack.[[1]](https://google.com/goto?url=CAESWgHrOzAVqyJnXDvnjp1NFwyRlcly2zPNb_BGMuSLCXCa09YJuYc1WU25JmgrVZdg2FEPrBkYi2v4J6Y3_5-Yzic9Gia78hk1VhaEEbfwxqyQnpc5brIGB3JRXA)[[2]](https://google.com/goto?url=CAESbwHrOzAV9fVzgV5Y8CPEvogUUARIrT6PtCJOZ9f9g4Yl_t5tp_KrHK0KFlWNqYh_J07QGDYA7rLsRUbwPulNKYRbOcxE7YXW7mx1sNuoBsGShRgzrfllf8tTcy1DJhM1r3n9t3N0JwfGbWL_TfIdbg)[[3]](https://google.com/goto?url=CAESTgHrOzAVS-8vc7QloHd3wq83z3x9-6gfLraD6XJ-oohxd09tC7YONg8NK_errVPkJ9bkNp5OiQB-UUo-8anhJpx-2MlthxzVTI7cBOFIAw)[[4]](https://google.com/goto?url=CAESiQEB6zswFTgE4EDAjLZDC7cQSZV8wBXAagqLlPNBDEE5hQzGm4UkyAAYfaRh-CZQb5Ff23qomyNDU0hAP2d5Dh2NSE15dv1jHqjNhqci022GfwIw5ipN5et_GOZDBy_hdXq48BU6ixR2FYbSJEiWersZKHK2LIPe8dJ6HYn-iySCdwDYZlaUmp0IHQ)

Decision Summary

• Choose Qovery if you want the fastest path to a literal Heroku clone on your Kubernetes cluster.
• Choose Humanitec if you need enterprise-grade modularity and complex environment management.
• Choose Port if you want to blend a service catalog with custom self-service workflows.

To help narrow down the ideal fit, tell me:

• Are you running on a managed Kubernetes service (EKS, GKE, AKS) or self-hosted?
• Do your developers prefer a CLI, a web UI, or GitOps (PR-driven) workflows?
• What is the size of your engineering team and platform maintenance capacity?

If your goal is specifically “Heroku, but running on our existing Kubernetes cluster”, my recommendation would be:

My pick: Humanitec

humanitec.com is probably the closest fit to the experience you're describing. It is less a “developer portal” and more an application deployment/orchestration layer that sits between developers and Kubernetes. Its Platform Orchestrator can take a developer-oriented workload definition, provision the required resources, and deploy to your existing Kubernetes clusters.

The important distinction is:

Don't build “Heroku UI → Kubernetes.” Build “Heroku workflow → platform abstractions → Kubernetes.” Humanitec's Score specification is particularly interesting here. Developers can describe things like “run this container, expose port 8080, give me PostgreSQL,” rather than knowing about Deployments, Services, Ingresses, Helm, namespaces, etc.

A developer experience could therefore look like:

git push
   │
   ▼
CI builds container
   │
   ▼
platform deploy myapp
   │
   ├── creates/updates Kubernetes workload
   ├── creates ingress
   ├── injects secrets/config
   ├── provisions dependencies
   ├── applies resource limits/policies
   └── returns https://myapp.dev.company.com

That's much closer to Heroku than giving developers a Kubernetes dashboard.

How I'd compare the major options

The 2026 IDP landscape increasingly separates portal/catalog from orchestration/provisioning rather than treating them as one product.

Why I wouldn't start with Backstage

backstage.io is fantastic, but it is easy to mistake it for an IDP.

Backstage gives you the front door:

Developer
    ↓
Backstage
    ↓
"Create service"
    ↓
GitHub repo
CI pipeline
Kubernetes manifests
Argo CD
Terraform
...

But you still have to build and maintain most of the machinery behind that experience.

That's great if your organization has a substantial platform-engineering team and wants a highly customized internal product. It's less attractive if your primary objective is:

“Give developers a Heroku-like git push experience on our Kubernetes cluster.”

What I'd actually build

I'd use Humanitec or a similar orchestration layer underneath, and keep the developer interface extremely simple.

For example:

                    Developer
                        │
             ┌──────────┴──────────┐
             │                     │
          CLI/API               Portal
             │                     │
             └──────────┬──────────┘
                        ▼
              Internal Platform API
                        │
                ┌───────┴───────┐
                │               │
             Deploy          Provision
                │               │
                ▼               ▼
           Kubernetes      DB / Redis / S3
                │
                ▼
        Ingress / DNS / TLS

The platform should expose a small number of golden paths, such as:

• Web service
• Worker
• Scheduled job
• Static frontend
• PostgreSQL-backed service
• Redis-backed service

A developer shouldn't need to know whether your implementation uses Helm, Kustomize, Argo CD, Crossplane, Terraform, operators, or raw Kubernetes manifests.

That's the key architectural decision.

When I'd choose something else

Choose Qovery if your priority is maximum PaaS experience with minimum platform engineering. It's particularly attractive if you're willing to let the product impose more of its deployment model.

Choose Port if your bigger problem is developer discoverability/self-service rather than deployment orchestration. Port is much more of a portal layer; you can connect it to the infrastructure machinery you already have.

Choose Backstage if you have a strong platform team and want to build a deeply customized internal developer product. Its flexibility is its greatest strength—and its biggest cost.

Choose Kratix + Argo CD + Crossplane if you specifically want an open-source, composable platform foundation and have the engineering capacity to own it. That's the route I'd take if avoiding vendor dependency is more important than time-to-value.

One important caveat

I wouldn't make Humanitec itself the architectural centerpiece simply because it has the nicest demo. The more durable design is to establish your own platform contract first.

For example:

service:
  name: payments-api
  type: web

image:
  repository: registry.example.com/payments
  tag: 1.42.0

resources:
  cpu: 500m
  memory: 512Mi

network:
  public: true

dependencies:
  postgres: true
  redis: false

environment:
  - staging

Your developers interact with that abstraction. Your platform translates it into whatever Kubernetes/IaC implementation you choose.

Humanitec's Score model is one existing implementation of this philosophy: it provides a platform-agnostic workload specification while the platform determines how that workload gets realized.

Bottom line

If I were evaluating this for an engineering organization today, I'd shortlist:

1. Humanitec — best match for “Heroku on our Kubernetes.”
2. Qovery — best if you want a more turnkey PaaS.
3. Port + your existing deployment stack — best if the portal/self-service experience is the primary gap.
4. Backstage — best if you're prepared to build and own an internal platform product.
5. Kratix/Argo CD/Crossplane — best DIY/open-source route.

And I would not start by building a Backstage portal. I'd start by defining the developer-facing deployment contract and golden paths; the UI can come afterward.

If you tell me roughly how many developers/services you have, whether you're on EKS/GKE/AKS/on-prem, and what you currently use for CI/CD (GitHub Actions, GitLab, Jenkins, Argo, etc.), I can give you a concrete architecture and a Humanitec vs Qovery vs Backstage vs DIY recommendation for your environment.

git push
   │
   ▼
CI builds container
   │
   ▼
platform deploy myapp
   │
   ├── creates/updates Kubernetes workload
   ├── creates ingress
   ├── injects secrets/config
   ├── provisions dependencies
   ├── applies resource limits/policies
   └── returns https://myapp.dev.company.com

That's much closer to Heroku than giving developers a Kubernetes dashboard.

How I'd compare the major options

The 2026 IDP landscape increasingly separates portal/catalog from orchestration/provisioning rather than treating them as one product.

Why I wouldn't start with Backstage

backstage.io is fantastic, but it is easy to mistake it for an IDP.

Backstage gives you the front door:

Developer
    ↓
Backstage
    ↓
"Create service"
    ↓
GitHub repo
CI pipeline
Kubernetes manifests
Argo CD
Terraform
...

But you still have to build and maintain most of the machinery behind that experience.

That's great if your organization has a substantial platform-engineering team and wants a highly customized internal product. It's less attractive if your primary objective is:

“Give developers a Heroku-like git push experience on our Kubernetes cluster.”

What I'd actually build

I'd use Humanitec or a similar orchestration layer underneath, and keep the developer interface extremely simple.

For example:

                    Developer
                        │
             ┌──────────┴──────────┐
             │                     │
          CLI/API               Portal
             │                     │
             └──────────┬──────────┘
                        ▼
              Internal Platform API
                        │
                ┌───────┴───────┐
                │               │
             Deploy          Provision
                │               │
                ▼               ▼
           Kubernetes      DB / Redis / S3
                │
                ▼
        Ingress / DNS / TLS

The platform should expose a small number of golden paths, such as:

• Web service
• Worker
• Scheduled job
• Static frontend
• PostgreSQL-backed service
• Redis-backed service

A developer shouldn't need to know whether your implementation uses Helm, Kustomize, Argo CD, Crossplane, Terraform, operators, or raw Kubernetes manifests.

That's the key architectural decision.

When I'd choose something else

Choose Qovery if your priority is maximum PaaS experience with minimum platform engineering. It's particularly attractive if you're willing to let the product impose more of its deployment model.

Choose Port if your bigger problem is developer discoverability/self-service rather than deployment orchestration. Port is much more of a portal layer; you can connect it to the infrastructure machinery you already have.

Choose Backstage if you have a strong platform team and want to build a deeply customized internal developer product. Its flexibility is its greatest strength—and its biggest cost.

Choose Kratix + Argo CD + Crossplane if you specifically want an open-source, composable platform foundation and have the engineering capacity to own it. That's the route I'd take if avoiding vendor dependency is more important than time-to-value.

One important caveat

I wouldn't make Humanitec itself the architectural centerpiece simply because it has the nicest demo. The more durable design is to establish your own platform contract first.

For example:

service:
  name: payments-api
  type: web

image:
  repository: registry.example.com/payments
  tag: 1.42.0

resources:
  cpu: 500m
  memory: 512Mi

network:
  public: true

dependencies:
  postgres: true
  redis: false

environment:
  - staging

Your developers interact with that abstraction. Your platform translates it into whatever Kubernetes/IaC implementation you choose.

Humanitec's Score model is one existing implementation of this philosophy: it provides a platform-agnostic workload specification while the platform determines how that workload gets realized.

Bottom line

If I were evaluating this for an engineering organization today, I'd shortlist:

To deliver a true Heroku-like experience (git push/pr-based deploys, automatic preview environments, simple environment variables, and zero Kubernetes manifest wrangling) on top of your existing Kubernetes cluster, you need a specialized Platform Orchestrator / PaaS-style IDP rather than just a generic developer portal.

The top internal developer platforms tailored explicitly for a Heroku-like Kubernetes workflow divide into three distinct architectural categories:

1. The Best "Out-of-the-Box" Heroku Clones for Kubernetes

If your primary goal is making Kubernetes completely invisible to developers on day one, these platforms act as a direct PaaS layer over your cluster.

• Qovery
  • The Vibe: The closest true Heroku/Vercel experience for Kubernetes.
  • How it works: Connects directly to your AWS/GCP/Azure or on-prem Kubernetes cluster. Developers get an intuitive UI/CLI where they can deploy apps, attach managed databases, and spin up preview environments on every Pull Request.
  • Pros: Insanely fast setup for a fully managed internal PaaS; handles preview environments brilliantly.
  • Cons: Opinionated workflow; you trade some underlying granular K8s control for ultimate developer simplicity.
• Northflank
  • The Vibe: Powerful full-stack orchestration with a gorgeous Heroku-meets-Render UI.
  • How it works: Runs workloads directly inside your connected Kubernetes clusters. It allows you to build and run jobs, microservices, and databases with automated CI/CD builds natively.
  • Pros: Highly flexible, handles complex multi-service architectures and background workers seamlessly.
  • Cons: Interface has a learning curve for administrators configuring the cluster hooks.

2. The Best Platform Orchestrator (For Custom "Golden Paths")

If you want to define dynamic infrastructure specifications and let platform engineers build custom abstractions without locking into a rigid SaaS interface.

• Humanitec
  • The Vibe: The industry standard for Platform Orchestration.
  • How it works: Instead of imposing a rigid UI, Humanitec lets platform engineers build an internal Developer Control Center via its scoring/orchestrator engine. Developers use a portal to push configurations, and Humanitec dynamically generates the raw Kubernetes manifests or Terraform code under the hood.
  • Pros: Unmatched flexibility; lets you map any complex architecture, RBAC, and cloud resource safely.
  • Cons: Requires a dedicated platform engineering effort to design the "golden paths" and resource definitions upfront.

3. The Portal-First Approach (Custom Assembly)

If you already have a sprawling toolchain and want a customizable catalog to stitch your own Heroku-like actions together.

• Backstage (by Spotify) / Port
  • The Vibe: The customizable "Developer Portal" framework.
  • How it works: A software catalog where developers view services, documentation, and templates (Scaffolder).
  • Pros: Highly extensible; backed by a massive community.
  • Cons: Backstage is a portal, not an IDP out-of-the-box. To get a "Heroku-like deploy" experience, you have to write and maintain a massive amount of custom plugins, software templates, and underlying CI/CD glue code yourself.

Summary Recommendation

• Choose Qovery if you want your developers off Kubernetes YAML forever within a week, and you want a turnkey Heroku-style UI/CLI over your cluster.
• Choose Humanitec if you are building an enterprise-grade internal platform engineering practice and need deep customization over how environments are dynamically provisioned.
• Skip Backstage for this specific use case unless you have a dedicated platform team ready to spend months building custom scaffolding templates and plugins to mimic a PaaS.

To help narrow down the best fit, tell me:

• Are your clusters cloud-managed (EKS, GKE, AKS) or self-hosted on-prem?
• Do your developers expect a web UI , a CLI , or purely a Git-driven workflow?

To deliver a Heroku-like, push-to-deploy experience on top of an existing Kubernetes cluster without forcing your developers to look at a single line of raw YAML, the market breaks down into three distinct approaches: Pre-packaged PaaS layers that sit on your cluster, Config/Environment Orchestrators , and Developer Portals.

Because you already have the Kubernetes cluster, you don't need an infrastructure-as-a-service provider—you need an execution and abstraction layer.

1. The Best "Drop-In" PaaS Layers (Closest to Heroku)

If your primary goal is a clean dashboard/CLI where developers point to a GitHub repo, press deploy (or git push), and get a live URL with automatic routing, SSL, and environment variables, use these:

• Porter : This is arguably the most direct fit if you want a Heroku UI on Kubernetes. It connects directly to your existing Kubernetes cluster (via agent or management link), provides a polished Heroku-style dashboard and CLI, and handles buildpacks, logs, and add-ons (like managed databases or Redis) natively. It abstracts Kubernetes completely for the developer while leaving full cluster access and resource tweaking open to platform engineers.
• Qovery : Marketed heavily as "Heroku for any cloud/Kubernetes," Qovery plugs directly into your existing Kubernetes cluster. It automates CI/CD, preview environments (ephemeral environments per pull request), and log routing out of the box. It gives developers a very clean, self-serve UI and handles the underlying Kubernetes resource generation seamlessly.
• Northflank : An extremely powerful execution layer that can connect to your own infrastructure (BYOC) or run managed. It provides native support for traditional microservices, jobs, cron, and databases while exposing a Heroku-simple UI/API/CLI on top of your container orchestration engine.

2. The Best for Declarative Config & Environment Orchestration

If your platform team wants granular control over how infrastructure is composed and prefers a system where developers request environments rather than individual containers:

• Humanitec : Humanitec is not a simple UI wrapper; it’s a Platform Orchestrator . You define "Resource Definition Trees" using their scoring engine, and developers use the portal or CLI to spin up entire sets of microservices and dependencies dynamically. It maps developer inputs into clean, standardized Kubernetes manifests or Terraform modules. It is ideal if you have a slightly larger platform engineering team that wants deep governance and customized architecture mapping rather than a rigid "out-of-the-box" PaaS.

3. The Portal Route (With a Caveat)

• Backstage (or commercial wrappers like Port or Roadie ): While Backstage is the industry standard for an Internal Developer Portal, it is a catalog, not an execution layer . Backstage will not give you a Heroku experience out of the box; you have to build or wire the CI/CD pipelines, container builders, and Kubernetes manifest generators yourself. If you choose Backstage, expect to dedicate software engineering headcount just to maintain the portal. Tools like Port offer a faster, no-code data-model approach to map your cluster resources, but you still have to orchestrate the actual deployments via GitHub Actions or webhooks.

Summary Recommendation

• Choose Porter or Qovery if you want to install an application on your cluster this week, hand your developers a UI/CLI where they can push code like it's Heroku, and minimize the custom code your platform team has to write.
• Choose Humanitec if you are an enterprise with complex, multi-environment constraints that need precise policy enforcement and dynamic architecture generation behind the scenes.

To help narrow down the right choice, tell me:

• Do your developers need ephemeral preview environments per pull request, or just standard staging/production deployments?
• Do you need the IDP to also manage and provision stateful add-ons (like Postgres/Redis inside K8s)?

If your goal is specifically “Heroku for our Kubernetes cluster”, I would not start with Backstage alone. Backstage is excellent as a developer portal/catalog, but it is fundamentally a framework you customize; the deployment/orchestration layer still has to be built or supplied.

My shortlist

🥇 My pick: Qovery

For the requirements you've described, I'd evaluate Qovery first.

Qovery is unusually close to the abstraction you're describing: developers deploy applications without needing to understand Kubernetes, while the platform team retains control of the underlying infrastructure. It supports Git-driven deployments, environments, databases and other resources, while running against infrastructure you control.

The developer experience can essentially become:

Create app → connect Git repo → choose environment → Deploy

rather than:

Write Helm chart → create namespace → configure Ingress → create secrets → configure HPA → fiddle with ArgoCD → debug Kubernetes YAML.

That is much closer to the Heroku mental model.

Qovery also gives you a CLI/API in addition to its UI, which is useful if you eventually want developers to automate deployments rather than making everything UI-driven.

🥈 Humanitec if you're building a serious platform team

I'd choose Humanitec if your real goal is broader than Kubernetes deployments—for example:

• standardized environments
• databases and queues
• cloud resources
• policy/guardrails
• multiple clusters/clouds
• infrastructure provisioning
• platform APIs
• sophisticated environment composition

Humanitec's architecture deliberately separates the developer-facing portal from the Platform Orchestrator, which handles configuration, infrastructure provisioning and application deployment. Its Score specification lets developers describe workloads without directly writing Kubernetes manifests.

That's a powerful model for a mature platform team.

🥉 Backstage if you want to own the experience

Backstage is the choice I'd make if you have a strong platform engineering team and want to create your own internal Heroku rather than buy one.

Backstage gives you:

• software catalog
• service ownership
• templates/scaffolding
• documentation
• Kubernetes visibility
• plugins
• custom self-service workflows

Its Kubernetes integration lets developers see deployments, pods and other Kubernetes resources associated with their services.

But there's an important distinction:

Backstage ≠ Heroku.

It's the front door. You still need to build the machinery behind the front door—typically some combination of Argo CD, Crossplane/Terraform, Helm, GitHub Actions, Kubernetes operators, etc.

---

What I'd actually build

If I were designing this for your organization, I'd aim for this architecture:

                    Developer
                       │
              ┌────────▼────────┐
              │  Developer UX   │
              │  Qovery /       │
              │  Backstage      │
              └────────┬────────┘
                       │
             "deploy my-service"
                       │
              ┌────────▼────────┐
              │ Platform Layer │
              │                │
              │ Environments   │
              │ Policies       │
              │ Secrets        │
              │ Resources      │
              └────────┬────────┘
                       │
             ┌─────────▼─────────┐
             │    Kubernetes     │
             │                   │
             │ Deployment        │
             │ Service           │
             │ Ingress           │
             │ HPA               │
             │ Config/Secrets    │
             └───────────────────┘

The critical design decision is to make “application” and “environment” first-class concepts, rather than exposing Kubernetes objects.

For example, developers should specify:

name: payments-api
runtime: node
port: 8080
replicas: 3

environments:
  - dev
  - staging
  - production

resources:
  cpu: 500m
  memory: 1Gi

and your platform should decide that this means:

• Deployment
• Service
• Ingress
• HPA
• resource limits
• network policies
• secrets integration
• observability
• deployment strategy
• appropriate namespace
• appropriate cluster
• appropriate security policies

That is the Heroku abstraction you're really after.

One important warning

Don't make developers choose between 20 Kubernetes options in your portal.

A good IDP should hide Kubernetes almost completely for the 80–90% case:

“Deploy my API.”

Then have an escape hatch for the 10–20% of workloads that genuinely need specialized Kubernetes configuration.

---

My recommendation

I'd run a short evaluation of Qovery vs Humanitec vs a Backstage-based build.

If you want the fastest path to Heroku-like: → Qovery

If you're building a strategic enterprise platform: → Humanitec

If you have a substantial platform team and want complete control: → Backstage + your own orchestration layer

And I would not choose Backstage simply because it's the most famous IDP. Current industry comparisons increasingly distinguish the developer portal from the orchestration layer; the latter is what makes the difference between a catalog of Kubernetes services and an actual self-service platform.

If you tell me roughly how many developers/services you have, whether you're using Argo CD/GitHub Actions, and whether the cluster is EKS/GKE/AKS/on-prem, I can narrow this down to a concrete architecture and tool choice.

If your goal is specifically “Heroku, but on top of our existing Kubernetes cluster”, I would not start with a generic developer portal. I’d choose an application deployment/orchestration layer and put a thin portal on top.

My recommendation: Humanitec

Humanitec is probably the closest fit to your stated goal today.

Its Platform Orchestrator is designed around exactly this model: developers describe an application and its dependencies, while the platform team owns the Kubernetes/infrastructure implementation, policies, environments, and provisioning. It supports existing Kubernetes clusters and can work with GitOps tools such as Argo CD or Flux.

The developer experience can look roughly like:

git push
   │
   ▼
┌──────────────────────────┐
│     Your Developer       │
│                          │
│  "Deploy my application" │
└────────────┬─────────────┘
             │
             ▼
      ┌──────────────┐
      │   IDP / CLI  │
      └──────┬───────┘
             │
             ▼
   ┌──────────────────────┐
   │ Humanitec Orchestrator│
   │                      │
   │ policies             │
   │ environments         │
   │ resources            │
   │ deployment strategy  │
   └──────────┬───────────┘
              │
              ▼
        ┌───────────┐
        │ Kubernetes│
        └───────────┘

Humanitec's Score workload specification is particularly interesting for a Heroku-like experience: developers describe things such as “I need a container + PostgreSQL + public HTTP endpoint” rather than directly authoring Kubernetes manifests.

How I'd rank the alternatives

The important distinction is that Backstage, Port and Cortex are primarily developer-portal products, whereas Humanitec is an orchestration engine. Current industry comparisons increasingly treat those as separate layers rather than competing products.

What I'd actually build

For a serious internal platform, I'd aim for:

Developer experience

"Create service"
      ↓
GitHub/GitLab repo
      ↓
One config file
      ↓
git push
      ↓
build → deploy → URL

Developer shouldn't need to know about:

• Helm
• Kubernetes namespaces
• Ingress
• Deployments
• Services
• Argo CD
• Terraform
• cloud IAM
• resource quotas

Your platform team should own those details.

Platform layer

                    ┌── PostgreSQL
                    ├── Redis
Developer ── IDP ───┼── S3
                    ├── Kafka
                    ├── DNS
                    └── Kubernetes

The platform exposes capabilities, not infrastructure primitives.

For example:

service:
  name: payments-api
  runtime: node

resources:
  postgres: true
  redis: true

expose:
  port: 8080

Your platform translates that into whatever Kubernetes/IaC/ cloud configuration is appropriate.

That's the key architectural decision: don't give developers Kubernetes with a nicer UI. Give them a PaaS abstraction that happens to be implemented by Kubernetes.

Where Backstage fits

I wouldn't dismiss Backstage. It's excellent if you want a customizable developer portal/catalog containing:

• services
• owners
• documentation
• dependencies
• deployment status
• links to Grafana
• runbooks
• scorecards
• “create service” workflows

But Backstage is a framework, not the Heroku-like deployment engine itself. The engineering cost of building and maintaining the plugins and backend workflows can become substantial.

A strong architecture is therefore:

Backstage → Humanitec → Kubernetes

rather than:

Backstage → 37 custom plugins → Kubernetes

When I'd choose something else

Choose Qovery if your primary objective is “make Kubernetes feel exactly like a PaaS with minimum platform engineering.” It's worth evaluating alongside Humanitec.

Choose Port if the portal/catalog and self-service UX are more important than having a sophisticated orchestration layer.

Choose Backstage + your own Kubernetes operators/Argo CD/Crossplane if you have a substantial platform-engineering team and deliberately want to own the entire abstraction. This gives maximum control but is the most expensive route.

Choose Kratix if you strongly prefer an open-source, Kubernetes-native platform-engineering model and are comfortable assembling more of the system yourself.

My short answer

If you told me:

“We already have Kubernetes. We want developers to git push and get a running application without knowing Kubernetes.”

I'd shortlist Humanitec and Qovery, with Humanitec as my first evaluation.

If you told me:

“We want an internal portal/catalog that eventually becomes our engineering control plane.”

I'd look at Backstage and Port, potentially with Humanitec underneath.

And I would not start by building Backstage from scratch unless you already have dedicated platform engineers to operate it. The current market is increasingly separating the portal from the orchestration layer for precisely this reason.

If you give me your cluster setup (EKS/GKE/AKS/on-prem), CI/CD (GitHub Actions/GitLab/Jenkins), GitOps (Argo/Flux), cloud, and approximate developer count, I can narrow this to a concrete architecture and a 3–5 product bake-off.

To recreate a Heroku-like, push-to-deploy developer experience on top of an existing Kubernetes cluster without forcing developers to write raw YAML or Terraform, the market has split into two main approaches: Turnkey PaaS Layers (which give you an instant Heroku UI/CLI on your own cloud) and Composable IDP Frameworks (which let you build a custom portal).

Category 1: Turnkey Kubernetes PaaS (The True "Heroku on Your Cluster" Approach)

If your primary goal is to bypass the 12-to-18-month timeline of assembling an IDP from scratch and immediately give developers an app-centric dashboard, logs, and automatic environment promotion, these tools sit directly on your Kubernetes cluster (Bring Your Own Cloud / BYOC).

• Qovery: Widely regarded as the closest direct match to a self-hosted Heroku experience. It runs an agent inside your Kubernetes cluster, connects to GitHub/GitLab, handles preview/ephemeral environments, and provides a clean UI/CLI for developers to manage apps and managed databases without seeing a Kubernetes manifest.
• Northflank: A robust, developer-experience-focused control plane that deploys directly into your Kubernetes infrastructure (AWS, GCP, Azure, or bare-metal). It gives you PaaS-level ease of use—complete with automated builds, managed databases, secrets management, and real-time logs—backed by the raw muscle of your own K8s cluster.
• Porter: Specifically marketed as "Kubernetes without the complexity", Porter installs into your cluster and acts as a specialized Heroku-alternative dashboard. It translates standard git pushes or container images into secure Kubernetes deployments while retaining granular control for your platform team.

Category 2: Configurable Portals & Orchestration (The Custom / Enterprise Approach)

If you have a dedicated platform engineering team and want to build a bespoke "golden path" tailored strictly to your company's internal compliance and architecture rules, consider these foundational platforms:

• Humanitec: Instead of just being a UI portal, Humanitec provides a Platform Orchestrator. You define a workload specification (Score ), and Humanitec dynamically maps it down to your Kubernetes cluster and cloud resources. It gives developers a high-level self-service UI for managing environments without exposing cluster operations.
• Port: A flexible, catalog-first internal developer portal builder. It features a powerful no-code data model where you can map services, define custom self-service actions (like "Create New App Space"), and attach developer scorecards quickly, though it requires more upfront configuration of your underlying CI/CD/K8s hooks than a turnkey PaaS.
• Backstage: The open-source standard created by Spotify. It features a massive plugin ecosystem and a powerful software template scaffolder. However, caveat emptor : Backstage is a framework, not an out-of-the-box Heroku clone. You will need a dedicated engineering team to wire up and maintain the Kubernetes, CI/CD, and infrastructure plugins.

Summary Recommendation

• Choose a turnkey solution like Qovery or Northflank if you want a plug-and-play Heroku experience up and running in days with minimal platform maintenance overhead.
• Choose an orchestrator like Humanitec if you want deep, customized infrastructure orchestration tailored to complex microservices.
• Choose Backstage or Port only if you have a dedicated platform team and need an enterprise-wide developer portal that handles service catalogs alongside infrastructure actions.

To help narrow down the ideal tool, tell me:

• What is the size of your engineering organization?
• Do your developers prefer Git push / UI / CLI workflows?
• Do you have a dedicated platform/DevOps team to maintain the tool, or do you need a turnkey solution?

If your goal is specifically “Heroku, but running on our Kubernetes”, I would not start with Backstage alone. Backstage is excellent as a portal/catalog, but you still need to build the actual deployment platform behind it.

My shortlist

🥇 I'd evaluate OpenChoreo first

OpenChoreo is particularly interesting for your use case because it is explicitly designed as a complete, open-source developer platform on top of Kubernetes, rather than merely a developer portal.

It provides:

• Developer abstractions over Kubernetes
• Golden paths/templates
• Application CI/CD
• GitOps
• Environments and promotion
• Observability
• RBAC/multi-tenancy
• A Backstage-powered developer portal
• CLI/API interfaces
• Multi-cluster support
• Kubernetes-native reconciliation

Its architecture separates a control plane from workload/data planes, so your developers don't need to understand the underlying cluster topology.

The developer experience is roughly what I'd want for a Heroku replacement:

Developer
   │
   │  "Create service"
   ▼
┌───────────────────────────────┐
│       Developer Portal        │
│        / CLI / API            │
└───────────────┬───────────────┘
                │
        Golden Path / Template
                │
                ▼
┌───────────────────────────────┐
│       OpenChoreo Control      │
│             Plane             │
└───────────────┬───────────────┘
                │
       reconcile / deploy
                │
                ▼
┌───────────────────────────────┐
│        Kubernetes             │
│                               │
│  Deployment                   │
│  Service                      │
│  Ingress/Gateway              │
│  Config / Secrets             │
│  Autoscaling                  │
└───────────────────────────────┘

A particularly good design choice is that Kubernetes isn't completely hidden. Developers get the higher-level abstraction, while platform engineers can inspect the underlying Kubernetes resources when necessary.

Why I wouldn't make Backstage the core

Backstage is fantastic for:

• service catalog
• ownership
• documentation
• software templates
• developer portal
• integrations

But Backstage is primarily the experience layer. You still have to assemble deployment orchestration, environments, GitOps, secrets, policies, Kubernetes abstractions, etc.

A common architecture becomes:

Backstage + Argo CD + Crossplane + Terraform + Kubernetes operators + CI + Vault + custom plugins + 5000 lines of glue

That can absolutely work, but you've effectively decided to build your own IDP.

---

🥈 Humanitec if you want to buy rather than build

Humanitec is probably the strongest commercial option I'd put next to OpenChoreo.

Humanitec's Platform Orchestrator is explicitly intended to be the orchestration layer of an IDP. Developers describe workload requirements, while platform engineers define the infrastructure/resource implementations behind those abstractions.

It has a particularly nice model:

Developer says:

"Run my service"
"Give me Postgres"
"Give me Redis"
"Deploy to staging"
"Promote to production"

              ↓

        Platform API

              ↓

       Humanitec Orchestrator

              ↓

 Terraform / Kubernetes / Cloud APIs / etc.

That separation is important: developers request capabilities; platform engineers decide how those capabilities are implemented.

Humanitec also supports Kubernetes/GitOps integration through its operator, including scenarios where you don't want the SaaS service directly exposing your cluster API.

The downside is obvious: you're buying into a commercial platform and its abstraction model.

---

What I would build

Regardless of which product you choose, I'd define your platform around four developer concepts:

1. Application

name: payments-api
owner: payments

2. Environment

payments-api
├── development
├── staging
└── production

3. Deployment

git push
    ↓
build image
    ↓
deploy development
    ↓
tests
    ↓
promote staging
    ↓
promote production

4. Resources

Developers should be able to request things like:

Postgres
Redis
S3 bucket
Kafka topic
Secrets
DNS
TLS

without knowing whether those ultimately become Terraform, Crossplane, an operator, or a cloud API.

That's the piece that makes it Heroku-like rather than “Kubernetes with a nicer UI.”

---

The most important design principle

I'd make the developer workflow something like:

Create repo → git push → platform builds → deploys → gives you URL → logs/metrics/traces available → promote between environments.

The developer should not have to know:

• Helm
• Argo CD
• Kubernetes Deployments
• Ingress
• namespaces
• service accounts
• Terraform
• cloud IAM
• container registries
• resource quotas

Those are platform implementation details.

At the same time, your platform team should retain control over all of them.

OpenChoreo's current architecture is unusually aligned with this philosophy: platform engineers define abstractions such as ComponentTypes and Traits, while developers consume them to create deployable Components.

My recommendation

If I were making the decision today:

1. OpenChoreo — evaluate first
Best match if you want open source + Kubernetes + Heroku-like developer experience + ability to own the platform.

2. Humanitec — evaluate second
Best if you're willing to pay for an orchestration layer and want to minimize the amount of IDP plumbing your team has to build and maintain.

3. Backstage + Argo CD + Crossplane/etc. — only if you deliberately want to build your own
Best for organizations with a substantial platform-engineering team and unusual requirements.

One interesting point: OpenChoreo is now a CNCF Sandbox project, and its current release explicitly positions it as a complete IDP rather than just another Backstage plugin collection.

If you tell me (a) your cloud/on-prem setup, (b) roughly how many developers/services, (c) whether you already use Argo CD/GitHub/GitLab, and (d) whether self-hosted/open-source is a requirement, I can narrow this down to an architecture and give you a concrete “Heroku on Kubernetes” reference stack.

To provide a true Heroku-like deployment experience on top of Kubernetes, the "best" internal developer platform (IDP) depends heavily on whether you want an all-in-one execution layer (PaaS-style abstraction) or an orchestrator/portal that wires your existing tools together . The top solutions that achieve this abstraction include Humanitec paired with a portal, Port, Northflank , and Backstage.

Top IDP Options for a Heroku-Like Experience

• Humanitec : Acts as a powerful platform orchestrator . It allows platform engineers to define "Scorecards" and application configurations where developers can spin up full environments (including databases and ingress) via a CLI or UI without touching a raw Kubernetes manifest . Best if you want strict architectural control over how infrastructure gets provisioned.
• Northflank : A complete IDP with a built-in control plane that natively runs services, jobs, and databases from a unified dashboard . It supports bring-your-own-cluster (BYOC) to your existing Kubernetes setup, offering the closest out-of-the-box Heroku/Vercel experience with zero-config deployments.
• Port : A commercial, highly customizable no-code internal developer portal . It provides a gorgeous service catalog and self-service actions , though you must hook it up to a backend execution layer like Argo CD or Crossplane to actually apply changes to Kubernetes.
• Backstage : The open-source portal framework created by Spotify . It is the gold standard for software catalogs and templates , but it is fundamentally a portal framework , meaning your team will spend considerable engineering hours writing TypeScript plugins and stitching together the underlying Kubernetes CI/CD mechanics.

Key Architectural Layers Needed

Regardless of the tool you pick, a Heroku-like experience requires three distinct layers working in harmony:

To help narrow down the best fit, could you share:

• Do you prefer a turnkey commercial SaaS/Hosted control plane (like Northflank) or an open-source framework your team will self-host and customize (like Backstage)?
• Do your developers expect to deploy just container images/source code , or do they also need self-service managed databases and caches (Postgres, Redis)?