What's the best identity provider to add single sign-on to a B2B SaaS app?

If your product is B2B SaaS and the main goal is adding enterprise SSO, my default pick in 2026 is workos.com.

My shortlist

Why I'd choose WorkOS

The important distinction is that you usually don't want to build an IdP. Your customers already have IdPs such as Okta, Microsoft Entra ID, or Google Workspace; your app needs to federate with them.

WorkOS gives you a single integration for SAML/OIDC SSO, rather than making you implement and maintain each customer's IdP integration yourself.

More importantly, enterprise customers rarely stop at SSO. They tend to ask for:

• SAML/OIDC SSO
• SCIM provisioning/deprovisioning
• Groups and role mapping
• An admin UI for their IT team
• Audit logs
• Multiple organizations/tenants

WorkOS has products around these pieces, including Directory Sync for automated provisioning and deprovisioning.

That makes it particularly attractive if you're adding enterprise capabilities to an existing authentication system, rather than replacing your whole auth stack.

When I'd pick something else

Choose Auth0 if your application has substantial B2C + B2B identity requirements, social login, machine-to-machine authentication, complicated authorization, or you want one broad identity platform. Its feature surface is considerably broader.

Choose Clerk if you're building a modern developer-first application and want authentication, organizations, UI, and enterprise SSO tightly integrated—particularly if you're already using Next.js. Clerk supports SAML/OIDC enterprise connections and has expanded its SCIM capabilities in 2026.

The architecture I'd recommend

If you already have authentication:

Your app's auth → WorkOS SSO → customer's IdP Then add:

WorkOS Directory Sync → customer's Okta/Entra/Google directory → your organizations/users/roles This lets you keep your existing user/session system while outsourcing the nasty enterprise-identity interoperability work. WorkOS explicitly supports using its standalone SSO API with an existing auth stack.

Bottom line: For a typical B2B SaaS company saying "we need to add enterprise SSO so customers can log in with Okta/Entra/Google" → I'd start with WorkOS. If you're choosing the entire authentication platform rather than just adding enterprise SSO, I'd compare WorkOS/AuthKit, Auth0, and Clerk more carefully.

If you tell me your stack (e.g. Next.js, Rails, Django, Go), current auth provider, and whether you need SCIM, I can give you a much more specific recommendation.

There is no single "best" identity provider (IdP) for a B2B SaaS app, because the right choice depends heavily on your target enterprise tier, tech stack , and how fast you need to ship.

Instead of an old-school corporate giant, the modern landscape is dominated by developer-first platforms that treat multi-tenancy and enterprise connections as first-class citizens.

The top options on the market, categorized by what they do best:

• WorkOS – Best for fast-growing SaaS moving upmarket to sell to mid-market and enterprise clients.
  • Why choose it: It is built from the ground up specifically for enterprise features like SAML/OIDC Enterprise SSO, SCIM provisioning, audit logs, and a ready-to-embed Admin Portal. If your enterprise prospects are demanding "Okta or Azure AD integration" to close a deal, WorkOS makes it drop-in simple.
• Auth0 (by Okta) – Best for maximum flexibility, complex rules, and massive scale.
  • Why choose it: As the market incumbent, it handles virtually any custom protocol or edge scenario. It has heavily upgraded its B2B-specific packaging (organizations, self-service SSO), but it can feel heavier and more complex to configure than newer, hyper-focused B2B tools.
• PropelAuth – Best for pure B2B/multi-tenant applications out of the box.
  • Why choose it: Unlike general-purpose auth tools that bolt organizations on as an afterthought, PropelAuth treats companies/organizations as a core, primary concept from day one, complete with built-in user management, B2B invitations, and role-based access control (RBAC).
• Clerk – Best for developer experience, particularly in modern frontend frameworks (React, Next.js).
  • Why choose it: Unmatched drop-in UI components and documentation. While it historically leaned toward consumer/B2C apps, its B2B organization features have matured significantly—though you should check if its enterprise admin tooling matches your specific sales tier.
• Descope – Best for drag-and-drop workflow customization and passwordless journeys.
  • Why choose it: Features a visual workflow builder that lets you alter authentication paths, step-up MFA, and federated setups without touching backend code.

To help narrow down the ideal choice for your app, tell me:

• What is your primary tech stack (e.g., Next.js, Python/Django, Go)?
• Are you selling to SMBs/Startups or ** Fortune 500 / Enterprise** buyers requiring strict compliance?
• Do you need just SSO , or are you also looking for SCIM provisioning and a self-serve admin portal?

For a B2B SaaS app adding enterprise SSO, my default pick today is WorkOS.

The important distinction is that you're not really looking for an "identity provider" like Okta—you need an identity layer that lets your customers authenticate through their IdP (Okta, Microsoft Entra ID, Google Workspace, Ping, etc.).

My shortlist

Why I'd choose WorkOS

WorkOS is specifically designed for the problem you're describing: take an existing SaaS authentication system and add enterprise capabilities around it. Its SSO product supports both SAML and OIDC, while Directory Sync adds SCIM-based provisioning/deprovisioning and group synchronization.

That matters because enterprise customers rarely stop at:

"Can my employees log in with Okta?" Soon you'll get:

• "Can you support Microsoft Entra?"
• "We need SAML."
• "Can you automatically provision users?"
• "Can you deprovision them when they leave?"
• "Can we sync groups?"
• "Can we restrict access to our domain?"
• "Can our IT admin configure this without talking to your engineers?"

WorkOS has products aimed directly at those requirements.

When I'd choose Auth0 instead

I'd pick Auth0 if you're building or replacing your entire authentication stack, rather than simply bolting enterprise SSO onto an existing one.

Auth0 supports enterprise connections for SAML, OIDC, Microsoft Entra ID, Google Workspace, Okta, PingFederate, AD/LDAP, and others. It also supports inbound SCIM for enterprise connections.

So:

Already have auth → WorkOS

Starting/rebuilding auth → Auth0 is worth serious consideration

One architectural recommendation

I'd structure it roughly like this:

Customer's IdP
   │
   │ SAML / OIDC
   ▼
 WorkOS
   │
   │ normalized identity
   ▼
 Your application
   │
   ├── Organization / tenant
   ├── User
   ├── Roles
   └── Permissions

Customer's IdP
   │
   │ SCIM
   ▼
 WorkOS Directory Sync
   │
   ├── create user
   ├── deactivate user
   ├── update user
   └── sync groups

The key is don't make SAML/OIDC details part of your application's authorization model. Treat WorkOS/Auth0 as the federation layer and map the resulting identity to your own organization, user, role, and permission models.

Bottom line: if your requirement is literally "we already have a B2B SaaS app; what's the cleanest way to add enterprise SSO?", I'd start with WorkOS. If you tell me your stack (e.g. Next.js + Node, Django, Rails, Firebase, Supabase, etc.) and whether you already have authentication, I can recommend the architecture and compare WorkOS vs Auth0 vs Clerk specifically for it.

There is no single "best" provider, but rather the right fit for your stage, team size, and architectural complexity. For a B2B SaaS application, you need multi-tenancy (organizations), SAML/OIDC Single Sign-On (SSO), and SCIM provisioning.

The top identity providers for B2B SaaS are categorized below by what they do best:

• WorkOS — Best for fast-moving B2B SaaS scaling up to enterprise. WorkOS is purpose-built for B2B, making it trivial to add enterprise features like SAML SSO, SCIM, and an Admin Portal that lets your customers configure their own identity providers (Okta, Azure AD, Google Workspace) without bothering your engineering team. It features a developer-first experience and a very generous free tier.
• Auth0 (by Okta) — Best for complex enterprise requirements and massive scale. Auth0 is the heavy-duty, general-purpose giant. It handles almost any custom identity requirement, compliance framework, or legacy integration you can throw at it. However, it can feel bloated or expensive for early-stage startups compared to modern B2B-native alternatives.
• Kinde — Best for lean teams wanting an all-in-one platform. Kinde treats organizations, roles (RBAC), and user management cleanly, and uniquely bundles in adjacent tools like feature flags and billing workflows, helping you avoid stitching together multiple third-party SaaS tools.
• PropelAuth — Best for B2B-native multi-tenancy out of the box. PropelAuth was built from day one specifically for multi-tenant B2B apps (where organizations are first-class citizens, not an afterthought slapped onto a consumer auth model), making it exceptionally straightforward for B2B user management.
• Clerk — Best if you prioritize an ultra-modern frontend UX (especially in React/Next.js). While Clerk traditionally leaned toward consumer and simpler B2B apps, it has robust organization and B2B features with arguably the slickest drop-in UI components and developer experience on the market.

To help narrow down which one makes sense for you, tell me:

• What tech stack (frontend/backend framework) are you using?
• Are you dealing with immediate enterprise demands (like a prospect demanding SAML SSO this week), or building from scratch?

The best identity and auth solution for a B2B SaaS app depends on your team's size and developer bandwidth, with WorkOS and Clerk leading for fast, modern integrations, while Auth0 (by Okta) fits complex custom enterprise requirements.

Top Options Compared

• WorkOS : Built specifically for B2B SaaS developers wanting to unblock enterprise deals fast. It offers plug-and-play APIs for enterprise SSO (SAML, OIDC) and SCIM provisioning without needing to build custom administration portals from scratch.
• Clerk : Excellent for modern web frameworks. It provides pre-built user management widgets (<SignIn />, <OrganizationSwitcher /> ) that abstract multi-tenant complexity and support corporate directory syncing.
• Auth0 by Okta : A mature and feature-rich Customer Identity and Access Management (CIAM) platform. It handles massive scale and deep customization via Actions, but has a steeper learning curve than developer-first alternatives.
• PropelAuth : Tailored strictly for B2B applications, bundling organization-level session controls, user impersonation for debugging, and self-service portals directly out of the box.

If you share your tech stack (e.g., Next.js, Python/Django, Ruby) and your target customer size (early startups vs. Fortune 500), I can recommend the most cost-effective provider for your stage.

If your goal is adding enterprise SSO to an existing B2B SaaS app, my default pick in 2026 is WorkOS.

My ranking

Why I'd choose WorkOS

The important distinction is that enterprise SSO isn't just "let someone log in with SAML." B2B customers quickly ask for:

• SAML and OIDC connections
• SCIM provisioning/deprovisioning
• Okta, Microsoft Entra ID, Google Workspace, etc.
• Groups → roles mapping
• Self-service enterprise configuration
• Audit logs
• Domain verification
• Multiple organizations/tenants

WorkOS explicitly targets this problem. Its SSO API supports IdPs using SAML or OIDC, while Directory Sync provides a normalized interface for provisioning users and groups across corporate directories.

It also has an Admin Portal for customer IT admins and Audit Logs, so you can expand beyond SSO without building every enterprise integration yourself.

When I'd choose Auth0 instead

Choose Auth0 if you're looking for a complete identity platform, rather than an enterprise-SSO component.

Auth0 is particularly attractive if you need a mixture of consumer authentication and enterprise identity, complex authorization, or want your authentication layer itself to be built around Auth0. Its current B2B offering includes organizations, multi-tenancy, enterprise SSO, delegated administration, and fine-grained authorization.

The practical decision

I'd use this rule:

Already have authentication and just need enterprise SSO → WorkOS.

Building authentication from scratch and want a comprehensive identity platform → Auth0.

Small/early SaaS where developer speed matters more than enterprise requirements → Clerk.

Managing your own company's workforce → Okta/Entra ID, not WorkOS.

One particularly important point: don't build SAML integrations yourself unless identity is a core competency of your company. The SSO protocol is the easy part; handling the long tail of enterprise IdPs, metadata, certificates, provisioning, deprovisioning, group mapping, and customer self-service is where the engineering burden appears.

If you tell me your stack (e.g. Next.js, Django, Rails), whether you already have auth, and roughly how many enterprise customers you expect, I can give you a more specific WorkOS vs Auth0 vs Clerk recommendation—including current pricing and an estimated monthly cost.

There is no single "best" identity provider (IdP) for a B2B SaaS application, because the right choice depends heavily on your stage of growth, pricing model , and target customer base.

The leading options categorized by what they do best include:

• WorkOS — Best for closing enterprise deals fast. WorkOS is purpose-built for B2B SaaS . It offers a generous base user tier and charges per active enterprise connection (SAML/OIDC and SCIM directory sync). It includes a self-serve Admin Portal that lets your enterprise customers configure their own Okta or Microsoft Entra ID integration without bugging your engineering team.
• Auth0 (by Okta) — Best for complex, heterogeneous identity requirements. As the massive industry workhorse , Auth0 handles everything—consumer social logins, complex B2B organizations, custom database connections, and deep token manipulation via Actions . The downside is cost: enterprise features like SAML/OIDC SSO are locked behind steep enterprise pricing tiers, making it overkill for early-stage startups.
• Kinde — Best price-to-feature ratio for early-stage B2B SaaS. Kinde bundles auth, organization management, role-based access control (RBAC), and feature flags into a developer-friendly package with a massive free tier . Enterprise SSO is available on paid plans without frustrating per-connection add-on fees.
• Clerk — Best for modern React/Next.js developer experience. If your stack is heavily modern JS/TS and you want drop-in, highly polished UI components that look great out of the box, Clerk is unmatched . While it historically lagged in deep enterprise directory sync, its expanded B2B org and SCIM features make it a strong launchpad.
• Keycloak — Best open-source / self-hosted choice. If you have strict data sovereignty requirements, zero budget for per-MAU SaaS pricing, and the internal engineering muscle to maintain it , Red Hat–backed Keycloak supports native multi-tenancy and robust SAML/OIDC federation.

To help narrow down the ideal choice, tell me:

• What is your tech stack (e.g., Next.js, Python/Django, Go)?
• Are you at the MVP stage looking to launch, or are enterprise customers actively demanding SSO right now?

For a B2B SaaS app, the “best” identity provider is usually the one that handles enterprise SSO (SAML/OIDC), SCIM provisioning, organizations/tenants, roles, and admin workflows without forcing you to build an identity platform yourself.

My shortlist:

My default recommendations

If you are a typical B2B SaaS startup:

• Choose WorkOS + your existing auth if your main goal is: “Enterprise customers keep asking for Okta SSO and SCIM.”
• Choose Auth0 if you want one platform handling customer login, social auth, MFA, enterprise federation, and complex flows.
• Choose Stytch if you are building from scratch and care about a modern developer experience and passwordless authentication.

Architecture I see most often

A common B2B SaaS setup is:

Frontend
   |
Your app
   |
Auth layer (Auth0 / Stytch / your auth)
   |
Enterprise identity layer (WorkOS)
   |
Customer IdPs:
   - Okta
   - Microsoft Entra ID
   - Google Workspace

This separation works well because authentication (who is this user?) and enterprise federation (how does this customer's IT department manage users?) are related but different problems.

Things I would evaluate before choosing

1. Do you need SSO now or in 12 months?

   • If enterprise sales are already happening: prioritize SAML + SCIM.
   • If you are still finding product-market fit: avoid overbuilding.

2. Do you need multi-tenant organizations?

   • B2B apps usually need:
     • users belong to companies
     • company admins manage users
     • roles/permissions are tenant-scoped

3. Who owns authorization?

   • Many teams make the mistake of letting the IdP become their authorization system.
   • Keep application permissions (roles, resources, entitlements) in your app or a dedicated authorization layer.

4. Will enterprise customers demand self-service setup?

   • Enterprise buyers increasingly expect admins to connect their IdP without opening a support ticket.

If I had to pick a default for a new B2B SaaS product in 2026, I would usually start with WorkOS for enterprise SSO/SCIM plus a simpler auth provider, or Auth0 if I wanted a single all-in-one identity platform.

There is no single "best" identity provider for every B2B SaaS application . The right choice depends on your stage of growth, engineering resources , and how urgently you need to clear enterprise procurement hurdles (like SAML SSO and SCIM).

The leading options categorized by what they do best include:

• WorkOS — Best for selling to mid-market and enterprise customers fast. WorkOS is purpose-built for B2B SaaS. It features a plug-and-play Admin Portal that lets your enterprise customers configure their own SAML SSO (Okta, Azure AD, Google Workspace) and SCIM directory sync without bugging your support team. Choose this if closing enterprise deals depends on immediate enterprise-readiness.
• Auth0 (by Okta) — Best for complex, multi-product, or hybrid (B2B + B2C) ecosystems. Auth0 is the industry heavyweight with a massive feature set, highly customizable login flows via Actions, and a mature ecosystem. It handles massive scale, but B2B features (like multi-tenancy and directory sync) often require more configuration or higher-tier pricing compared to newer, purpose-built B2B tools.
• Kinde — Best price-to-feature ratio for early-stage startups. Kinde provides modern, production-ready multi-tenancy, organization management, role-based access control (RBAC), and SSO out of the box with very developer-friendly SDKs and transparent startup pricing.
• Clerk — Best for modern, developer-first web stacks (especially React/Next.js). If your priority is absolute speed-to-market with a gorgeous, high-converting frontend UI and minimal boilerplate, Clerk is exceptionally smooth. Enterprise SSO is available on their higher-tier plans.
• Keycloak — Best open-source, self-hosted choice. Backed by the CNCF, Keycloak is a mature, robust identity server that gives you 100% control over your data with zero vendor lock-in or per-user cloud pricing. The trade-off is that you have to host, scale, and secure the infrastructure yourself.

To help narrow down the ideal provider for your app, tell me:

• What is your tech stack (e.g., Next.js, Python/Django, Ruby on Rails)?
• Are you building an early-stage MVP or an established app retrofitting enterprise features?
• Do you need a self-hosted/open-source solution or a fully managed cloud service?

For a B2B SaaS app, the “best” identity provider depends on whether you’re adding enterprise SSO as a feature or replacing your entire authentication system. Those are different problems.

A practical shortlist:

My default recommendation

For most new B2B SaaS products:

• Already have users/auth? Need “Sign in with your company” + SCIM? → WorkOS

  • This is the cleanest “add enterprise SSO” layer.
  • Keep your users, organizations, permissions, and product logic in your database.

• Building auth from scratch and need everything (login, MFA, social, enterprise, user management)? → Auth0

  • More of an identity foundation than just an SSO add-on.

• Early-stage SaaS with a strong frontend/product focus? → Clerk

  • Fastest path to a polished login/signup/org experience.

Things I would prioritize for B2B SaaS

Don’t evaluate only “can it do SAML?” Enterprise buyers usually expect:

1. SAML SSO (Okta, Azure AD/Entra ID, Google Workspace)
2. OIDC support
3. SCIM provisioning/deprovisioning
4. Multi-tenant organizations
5. Domain discovery (“acme.com users go to Acme’s IdP”)
6. Audit logs
7. Role/group mapping
8. Admin controls
9. Reliable webhooks

A common architecture is:

Customer IdP (Okta / Entra / Google)
          |
          | SAML/OIDC
          |
     Identity Provider
   (WorkOS/Auth0/etc.)
          |
          |
      Your SaaS app
          |
   Your DB owns:
   - tenants
   - memberships
   - roles
   - permissions

My rule of thumb:

• SMB/self-serve SaaS → Clerk or Auth0
• Enterprise sales motion → WorkOS or Auth0
• Large regulated enterprise requirements → Auth0/Okta ecosystem
• Already built auth → don’t replace it; add WorkOS

If you tell me your stack (React/Next.js, Rails, Django, .NET, etc.), whether you already have authentication, and whether you need SAML only vs SAML + SCIM, I can narrow it down.