I need a cloud access security broker that provides visibility into shadow IT usage.

If your main requirement is visibility into shadow IT usage, look for a CASB that can discover unsanctioned SaaS apps, identify users and activity, risk-score applications, and provide controls to block or govern usage. Common enterprise options include:

When evaluating vendors, prioritize:

• Discovery method: Does it analyze network traffic (inline) as well as SaaS APIs? A hybrid approach usually gives better coverage.
• Application catalog depth: How many SaaS services can it identify and classify?
• Risk scoring: Can it rank apps by security posture, compliance, data handling, and user behavior?
• User-level visibility: Can you see who is using which apps, from what devices, and what data is being shared?
• Remediation controls: Can you block, coach users, require approval, or quarantine risky apps?
• GenAI discovery: Many organizations now include monitoring of unsanctioned AI tools as part of shadow IT governance.

A practical shortlist:

• Microsoft-heavy environment: start with Defender for Cloud Apps.
• Large enterprise with many SaaS apps: evaluate Netskope, Zscaler, and Palo Alto Networks.
• Existing Symantec/Broadcom stack: consider CloudSOC.
• SASE transformation project: compare CASB as part of an SSE platform rather than as a standalone product.

If you share your environment (Microsoft 365 vs Google Workspace, number of users, existing firewall/SASE vendor, and whether you need blocking or just visibility), I can narrow this to 2–3 best fits.

A Cloud Access Security Broker (CASB) is the ideal solution for discovering, assessing, and managing shadow IT . Modern CASBs typically operate in a "multimode" fashion—combining log analysis (firewalls, secure web gateways) for historical shadow IT discovery and inline proxies for real-time traffic steering and enforcement.

Leading enterprise CASB and Security Service Edge (SSE) platforms widely recognized for robust shadow IT visibility include:

• Netskope : Widely considered a market leader in CASB and SSE, Netskope Security Service Edge provides deep discovery of unauthorized cloud and generative AI apps, evaluating risk via a massive, continuously updated app catalog with granular scoring attributes.
• Palo Alto Networks (Prisma Access) : Integrates advanced CASB capabilities to automatically discover thousands of SaaS applications, shadow AI usage, and risky data transfers across distributed workforces.
• Microsoft Defender for Cloud Apps : A native enterprise option that logs and evaluates cloud discovery data from a wide array of firewall and proxy sources, providing deep out-of-the-box risk scoring for organizations already invested in the Microsoft 365 ecosystem.
• Cloudflare One : Combines Secure Web Gateway and CASB capabilities to discover shadow IT, inline-block unauthorized SaaS and AI tools, and enforce context-aware policies.
• Cisco Secure Access : Delivers cloud-delivered visibility to uncover unsanctioned application usage and monitor user interactions across multi-cloud environments.

To help narrow down the right platform for your environment, let me know:

• Are you looking for a standalone CASB or an integrated Security Service Edge (SSE) architecture?
• Do you already use a specific ecosystem (like Microsoft or Palo Alto ) for your security infrastructure?
• What kind of log sources or firewalls do you currently have in place for traffic ingestion?

To gain comprehensive visibility into shadow IT —discovering unauthorized cloud services, unmanaged SaaS subscriptions, and risky OAuth grants—you need a robust Cloud Access Security Broker (CASB) or a specialized identity-first cloud governance tool.

Top solutions known for deep shadow IT discovery and risk scoring include:

• Netskope CASB – A market leader offering an extensive cloud app catalog tracking over 65,000 SaaS applications. It provides deep visibility through log analysis and inline traffic steering to discover and dynamically score shadow IT risks.
• Microsoft Defender for Cloud Apps – Microsoft’s native CASB solution. It excels if you are embedded in the M365/Entra ID ecosystem, automatically discovering thousands of cloud apps, assessing their risk profiles, and monitoring data flows.
• Palo Alto Prisma Access – Combines CASB with Secure Access Service Edge (SASE), using machine learning to perform automated app risk scoring and continuous discovery of unauthorized cloud usage across network paths.
• Zscaler CASB – Built natively into the Zero Trust Exchange, providing rapid out-of-the-box visibility into shadow IT usage via proxy and log ingestion without requiring complex infrastructure agents.
• Nudge Security – A modern, identity-first alternative to traditional network-layer CASBs. It discovers shadow IT and OAuth-based SaaS app sign-ups directly through corporate identity providers, making it ideal for distributed or remote workforces.

To help narrow down the best fit, could you tell me:

• Are you looking for a network-based proxy/log parser or an API/identity-based discovery tool?
• What is your primary identity or enterprise ecosystem (e.g., Microsoft 365, Google Workspace, Palo Alto infrastructure)?

If shadow IT visibility is your primary requirement, I’d shortlist these CASB/SSE platforms:

My recommendation

Start with Microsoft Defender for Cloud Apps if you're already a Microsoft security customer. Its Cloud Discovery capability is purpose-built for Shadow IT: it analyzes traffic, identifies the cloud applications employees are actually using, assigns risk scores, and lets you designate apps as sanctioned or unsanctioned.

A particularly useful capability is its Defender for Endpoint integration: you can discover cloud-app usage directly from Windows endpoint network telemetry, including devices that aren't on your corporate network, without deploying additional traffic-routing infrastructure.

If you're selecting a standalone best-of-breed CASB, I'd evaluate Netskope alongside Defender and Skyhigh. Netskope emphasizes granular visibility into which users are using which apps, what they're doing, and what data is moving, rather than simply identifying the application.

If you tell me your environment (Microsoft 365, Google Workspace, hybrid, etc.), approximate number of users, and whether you need DLP/blocking in addition to visibility, I can narrow this to the best 2–3 options and compare them on features, deployment, and likely cost.

Several enterprise-grade Cloud Access Security Brokers (CASBs) specialize in discovering, scoring, and governing shadow IT usage. When evaluating solutions for comprehensive shadow IT visibility, consider these top platforms:

• Microsoft Defender for Cloud Apps : A powerful option if your organization already operates within the Microsoft 365 ecosystem. It continuously assesses traffic logs from your firewalls, secure web gateways, and endpoint agents to discover thousands of cloud apps, scoring them on over 70 risk factors.
• Netskope One (CASB/SSE) : A market leader in cloud-native visibility featuring a massive cloud app catalog covering upwards of 65,000 to 72,000 applications. Its network traffic inspection surfaces unsanctioned application usage and shadow AI tools in real time across managed and unmanaged devices.
• Palo Alto Networks Prisma Access : Delivers advanced CASB capabilities natively integrated into a broader Security Service Edge (SSE) architecture. It uses machine learning models to assign risk scores to discovered applications and enforces granular zero-trust access and data policies.
• Skyhigh Security (formerly McAfee/Trellix) : Renowned for its deep application intelligence via the Skyhigh Cloud Registry, tracking tens of thousands of SaaS, PaaS, and IaaS services. It provides detailed activity feeds and granular risk profiling to help security teams distinguish safe tools from risky data exfiltration channels.
• Zscaler Internet Access (ZIA) : Combines DNS-layer and inline proxy visibility to track unauthorized cloud and web application usage natively as part of its Zero Trust Exchange framework.

To help narrow down which CASB fits best, let me know:

• Are you looking for a standalone CASB or part of a broader Secure Service Edge (SSE) architecture?
• What firewalls, proxies, or endpoint telemetry sources do you currently use for log collection?

If your main requirement is visibility into shadow IT usage, look for a CASB with strong cloud app discovery, risk scoring, user/activity analytics, and unsanctioned app controls. Good options include:

Short recommendation by scenario:

• Best overall shadow IT discovery: Netskope
• Best if you already license Microsoft security tools: Microsoft Defender for Cloud Apps
• Best if you want CASB as part of a broader SSE/SASE platform: Zscaler or Netskope
• Best for compliance and DLP-focused environments: Broadcom Symantec CloudSOC or Forcepoint

When evaluating vendors, verify that the product can:

• Discover unknown SaaS applications from network traffic and logs
• Show which users are accessing which apps
• Assign risk ratings to discovered apps
• Detect unsanctioned GenAI tools (“shadow AI”)
• Support API integrations for sanctioned SaaS scanning
• Block, restrict, or coach users instead of only reporting

For many enterprises today, CASB is bundled into a broader Security Service Edge (SSE) platform rather than purchased as a standalone product.

If shadow IT visibility is the main requirement, I’d shortlist these CASB platforms:

My recommendation

For a general enterprise: Netskope. Its CASB is specifically designed to discover cloud services in use, assess their risk, and provide visibility across SaaS, IaaS and web activity.

For a Microsoft-heavy environment: Defender for Cloud Apps. It can ingest firewall/proxy logs or integrate with Defender for Endpoint to continuously identify which cloud apps employees are using, who is using them, and on which devices.

For a Zscaler environment: Zscaler CASB. It automatically identifies unsanctioned applications and assigns risk scores, while also providing controls to block, restrict, or permit access.

One important distinction: discovery alone isn't enough. If your goal is to find shadow IT and then control it, look for a CASB that supports continuous discovery + risk scoring + user/device attribution + policy enforcement + DLP.

If you tell me your company size, Microsoft/Google environment, and whether you already use Zscaler/Netskope/Palo Alto, I can narrow this to the best 2–3 options and compare licensing/deployment.

When looking for a Cloud Access Security Broker (CASB) or a modern Secure Service Edge (SSE) platform with strong shadow IT discovery, several industry-leading options stand out . They evaluate traffic logs, risk scores, and app behavior to give you full visibility into unsanctioned cloud and AI apps.

• Microsoft Defender for Cloud Apps : Best if you are already standardized on the Microsoft 365 ecosystem. It discovers thousands of cloud apps and assigns risk scores by ingesting logs from your firewalls, proxies, and endpoint telemetry.
• Netskope CASB : Widely recognized as a market leader for deep cloud visibility. It uses a cloud-native architecture to evaluate massive app catalogs, rate risk via a Cloud Confidence Index (CCI), and track shadow IT/AI usage in real time.
• Skyhigh Security CASB : Offers the comprehensive Skyhigh Cloud Registry (tracking tens of thousands of services) alongside granular activity monitoring and rich data governance features for compliance-heavy environments.
• Palo Alto Networks Prisma Access : A robust SASE/SSE solution that natively embeds enterprise-grade CASB controls to monitor and govern both sanctioned and unsanctioned application traffic across multi-cloud setups.
• Zscaler Internet Access (ZIA) : Provides powerful inline shadow IT discovery by leveraging a massive cloud security platform to inspect all web and proxy traffic, URLs, and DNS queries.

If you'd like to narrow this down, let me know:

• Are you already using a specific ecosystem like Microsoft 365 or Palo Alto firewalls?
• Do you prefer an inline/proxy-based approach or an API-driven SaaS discovery method?

If shadow IT visibility is your primary requirement, I’d shortlist these CASB platforms:

My recommendation: Microsoft Defender for Cloud Apps

If you're already a Microsoft shop, Defender for Cloud Apps is probably the first product I'd evaluate. Its Cloud Discovery capability analyzes traffic against a catalog of 31,000+ cloud apps, assigns risk based on 90+ factors, and provides visibility into the apps, users, devices and activity involved.

It can discover apps through Defender for Endpoint on managed Windows devices as well as through firewall/proxy logs, which helps extend visibility beyond the corporate network.

It also lets you move from discover → assess risk → sanction/unsanction → enforce controls, rather than just producing an inventory.

One important caveat: if your organization is heavily remote/BYOD and you need comprehensive visibility into browser-based SaaS usage, I'd compare Defender directly against Netskope and Zscaler in a proof of concept. The key question isn't just "how many apps can it catalog?" but how reliably can it observe unmanaged devices and non-SSO applications in your environment?

If you tell me your approximate number of users, Microsoft/Google environment, and whether users are mostly remote, I can narrow this to 2–3 products and give you a feature/cost-oriented comparison.

To uncover and monitor shadow IT (unsanctioned cloud and SaaS applications used by employees), several leading Cloud Access Security Brokers (CASBs)—often packaged under modern Security Service Edge (SSE) frameworks—stand out in the market.

Top options for shadow IT visibility include:

• Netskope Security Cloud Offers market-leading cloud app discovery with a massive catalog of over 65,000 evaluated apps. It provides deep visibility through multi-mode deployment (analyzing firewall/proxy logs or inspecting traffic inline via client/edge devices) to surface unauthorized app usage instantly.
• Microsoft Defender for Cloud Apps An ideal choice if you operate heavily within the Microsoft 365/Azure ecosystem. It discovers shadow IT by ingesting traffic logs from your existing firewalls and proxies, combining endpoint signals, and evaluating risk scores across thousands of cloud apps.
• Palo Alto Networks Prisma Access Delivers native CASB capabilities as part of a comprehensive SASE/SSE architecture. It utilizes machine learning to score application risk and trace unsanctioned network traffic across hybrid and multi-cloud enterprise footprints.
• Zscaler Zero Trust Exchange Provides inline discovery via cloud security proxy nodes (Zscaler Internet Access), giving you absolute visibility into HTTP/HTTPS and DNS traffic without needing appliance-heavy log collection.
• Skyhigh Security CASB Known for its exhaustive Cloud Registry database covering tens of thousands of services. It tracks granular user upload/download metrics, risk ratings, and data movements heading toward unauthorized destinations.

To help narrow down which of these fits best, please share:

• Are you looking for an inline network inspection approach (proxy/firewall logs) or an identity/API-based approach?
• Are you already heavily invested in an ecosystem like Microsoft or Palo Alto?