10 SSO Providers for B2B SaaS: 2026 Buyer’s Guide

The right SSO provider for a B2B SaaS product depends on what you already run and what enterprise customers expect you to add. A full CIAM platform can own authentication, organizations, authorization and customer administration. An enterprise-SSO layer can add SAML or OIDC connections to an existing identity stack. Open-source software gives your team more control and more operational responsibility.

This guide compares providers for customer-facing SSO inside a SaaS product. It does not rank employee SSO suites. For a full customer-identity replacement, the shortlist includes Frontegg, Auth0, Descope, Stytch and FusionAuth. For a modular SSO layer, start with WorkOS or Scalekit. Keycloak is the self-managed option in this comparison.

Claims cited in this guide were checked against the linked first-party pages on September 10, 2026. Vendors change limits and packaging, so confirm them before signing a contract.

Frontegg publishes this comparison and is one of the providers covered. We included products with current first-party documentation for customer-facing enterprise SSO and either a B2B organization model, a broader CIAM platform or a modular integration layer. This is not a paid ranking, and Frontegg is not awarded first place. We did not include workforce-only suites such as Microsoft Entra ID, Okta Workforce Identity, PingOne for Workforce and OneLogin. We compared intended use, operating model, enterprise connections, lifecycle provisioning, tenant administration, deployment and publicly available pricing. We did not score support quality, security or implementation speed without comparable independent tests.

SSO provider comparison at a glance

The columns compare operating model, enterprise-connection coverage, lifecycle provisioning and published pricing. On a smaller screen, scroll horizontally to inspect every column.

The table summarizes published product models, not benchmark results. A qualified or missing item is not a negative score: it means the capability is plan-dependent, preview-stage or not established by the first-party material we reviewed. We did not independently test latency, availability, support or implementation time across all ten products.

Customer SSO and workforce SSO solve different problems

A workforce identity provider helps a company’s employees reach internal applications. Okta Workforce Identity, Microsoft Entra ID, PingOne for Workforce and OneLogin are familiar examples. A customer-facing SSO provider helps your SaaS application accept each customer’s chosen identity provider while keeping organizations and access boundaries separate.

For SAML, your application is the service provider; for OIDC, it is the relying party or client. One customer might connect Okta through SAML, another might use Microsoft Entra ID through OIDC, and a third might require SCIM provisioning. Your system still has to resolve each login and lifecycle event to the correct tenant.

Read the SSO guide for the underlying flow, or compare SAML with OIDC before choosing a protocol.

Which SSO provider should you shortlist?

Use the operating model to make the first cut:

• Choose a full CIAM platform when you also need organizations, invitations, sessions, MFA, authorization and a customer administration experience.
• Choose an enterprise-readiness layer when your current authentication works and the immediate gap is SAML/OIDC SSO or directory provisioning.
• Choose a self-hosted or open-source system when infrastructure control outweighs the added upgrade, monitoring and incident-response work.
• Evaluate a workforce suite separately when the project concerns employee access rather than customers signing in to your product.

For a complete CIAM replacement, compare Frontegg, Auth0, Descope, Stytch and FusionAuth. For enterprise SSO added to an existing identity stack, compare WorkOS and Scalekit. Consider Clerk or PropelAuth when their organization model already matches your application, and Keycloak when your team has explicitly chosen to operate the identity layer.

When full CIAM is the buying job: If enterprise SSO is one requirement inside a broader multi-tenant identity project, compare full CIAM providers, including Frontegg, Auth0, Descope, Stytch and FusionAuth. Frontegg covers organizations, authentication, SSO and SCIM, authorization and customer-facing administration in the same platform. A modular provider may fit better when the existing identity stack should remain unchanged, while Keycloak may fit when self-management is required.

The next sections explain where each option starts to fit. The order is not a universal ranking.

10 SSO providers for B2B SaaS

Frontegg

Frontegg is built for customer identity in multi-tenant B2B applications. Unlike a standalone SSO connector, it combines authentication, organizations, enterprise SSO and SCIM, authorization and a customer-facing Admin Portal. This lets a SaaS company evaluate the login connection together with tenant resolution, lifecycle changes and the controls exposed to each customer’s administrators.

Its published PAYG plan starts at $0 and lists 7,500 monthly active users, five enterprise connections labeled SSO/SCIM, unlimited organizations and a custom domain. The public page does not explain whether mixed SSO and SCIM connections share one allowance, so buyers should confirm how they are counted. Enterprise packaging is custom.

Where Frontegg fits: include it in the proof of concept when customer organizations, tenant-scoped administration, authorization and lifecycle provisioning are part of the same project as SSO. This is a product-scope judgment, not a claim that Frontegg wins every SSO use case.

Trade-offs to verify: migration from an existing identity stack, connection economics at your projected customer count, deployment requirements and the exact plan needed for customer self-service.

During the proof of concept, test how existing users are linked after an enterprise connection is enabled, how a user with multiple organization memberships selects the correct tenant, and which SSO or SCIM setup steps a customer administrator can complete without your support team.

See Frontegg SSO and SCIM and current pricing.

Auth0

Auth0 is a general CIAM platform from Okta. Its Organizations and enterprise-connection features support B2B applications, while Actions and related extensibility features let teams customize identity flows.

Auth0’s current free B2B tier lists 25,000 MAU, five organizations, Self-Service SSO, SCIM and one enterprise connection. Limits and continued use vary by B2B plan and contract. Confirm the required organization and connection limits with the exact production plan because Okta’s workforce products and Auth0 use different packaging.

Shortlist Auth0 when: you want a broad CIAM platform and your team is comfortable configuring its extensibility model.

Check during the proof of concept: organization discovery, account linking, Actions maintenance, enterprise-connection limits and the customer-admin experience for SSO setup.

Clerk

Clerk provides authentication and organization features for web applications, with enterprise SAML and OIDC connections. It may suit teams already using Clerk’s SDKs and organization model.

Clerk measures usage in monthly retained users rather than monthly active users. Its pricing page lists Pro at $20 per month when billed annually and includes one enterprise connection. Linking enterprise connections to organizations and other B2B controls may require the Enhanced B2B add-on.

Shortlist Clerk when: your application already uses Clerk or your team prioritizes its frontend and framework integration model.

Check during the proof of concept: the total package required for organization-linked enterprise connections, verified domains, custom roles and any provisioning workflow you need. This comparison does not claim native SCIM support because the reviewed first-party pages did not establish it.

Descope

Descope combines tenant-aware B2B authentication with visual flow tooling. Its SSO material covers SAML and OIDC, service-provider and identity-provider initiated flows, multiple identity providers per tenant and a self-service setup suite.

The current pricing page lists 7,500 MAU, 10 tenants and three SSO connections on Free. Pro and Growth publish larger allowances and connection overages. SCIM and fine-grained authorization are positioned in Enterprise packaging, while the self-service SSO Setup Suite is paid-plan-only.

Shortlist Descope when: your team wants to model authentication through visual flows while retaining APIs and SDKs.

Check during the proof of concept: how flow changes are reviewed and versioned, what customers can configure themselves, and which SSO, SCIM and authorization features require Enterprise.

FusionAuth

FusionAuth offers hosted and self-hosted CIAM. The free Community edition gives teams a path to run the software themselves, while paid plans add support and enterprise features.

Its plan matrix shows that SAML capabilities vary by plan and flow, while SCIM is an Enterprise feature. FusionAuth’s limitations documentation says bulk user addition and deletion are available through APIs but are not currently supported through SCIM-compatible endpoints.

Shortlist FusionAuth when: the production architecture requires deployment control or self-hosting.

Check during the proof of concept: upgrade ownership, production support, tenant administration, the exact SCIM operations you need and the total infrastructure cost of the chosen deployment model.

Keycloak

Keycloak is an open-source identity and access management project with SAML and OpenID Connect support. Teams can run the project distribution without a commercial software license; infrastructure, operations and commercial support remain separate costs.

The trade-off is operational ownership. Your team is responsible for deployment, scaling, upgrades, security patches, observability and recovery unless a separate managed service or support provider takes that work. Keycloak 26.7 introduced a native SCIM API in preview; verify preview-feature policy and supported operations before relying on it in production.

Shortlist Keycloak when: your team has committed to operating identity infrastructure itself.

Check during the proof of concept: realm and tenant boundaries, upgrade procedures, required extensions, customer self-service administration, incident ownership and the path for automated provisioning.

PropelAuth

PropelAuth’s documentation covers B2B authentication with organizations, membership, roles, SAML/OIDC enterprise SSO and SCIM. Its vendor-published September 2026 comparison lists Free with 10,000 MAU and unlimited organizations, Growth at $150 per month with unlimited SAML/OIDC connections, and Growth Plus at $500 per month with SCIM priced per connection. Reconfirm contract pricing because this packaging is published in an article rather than a dedicated pricing page.

Shortlist PropelAuth when: its organization and role model matches the application you are building.

Check during the proof of concept: enterprise SSO packaging, provisioning scope, organization switching, custom authorization requirements and how the system behaves when one person belongs to several customers.

Scalekit

Scalekit offers both a full B2B authentication stack and a modular bring-your-own-auth layer with enterprise SSO and SCIM. Its Auth for SaaS pricing page publishes one free SSO connection and one free SCIM connection, with additional connections starting at $60 each. Two first-party Scalekit pricing URLs currently disagree on broader plan limits, so this guide does not quote those limits.

Shortlist Scalekit when: replacing your current login stack would create unnecessary migration work and your immediate requirement is enterprise SSO or provisioning.

Check during the proof of concept: how identities map back to your existing users, how tenant context is established, what happens during provider downtime, and how connection pricing changes as enterprise-customer count grows.

Stytch

Stytch provides B2B authentication with organizations, SSO, SCIM, sessions and authorization features. Its B2B pricing page lists 10,000 MAU, unlimited organizations and five SSO or SCIM connections in one combined allowance on PAYG. Additional connections are currently listed at $125 each.

Shortlist Stytch when: an API-first B2B identity platform and a built-in organization model match your architecture.

Check during the proof of concept: how the shared SSO/SCIM connection pool maps to your customer roadmap, how authorization policies are managed and how users with several organization memberships are handled.

WorkOS

WorkOS offers modular APIs for enterprise SSO, Directory Sync and user management. Teams can adopt individual components and keep more of their existing application identity architecture.

WorkOS prices Enterprise SSO and Directory Sync as separate products, each at $125 per connection for the first 15 connections. User Management is free up to one million users. Supporting one customer with both SSO and Directory Sync uses one connection in each product, so model the combination rather than treating one price as the complete identity bill.

Shortlist WorkOS when: your current authentication and application model should remain in place while you add enterprise-readiness components.

Check during the proof of concept: whether you need SSO, Directory Sync or both, how organizations and policies map into your application, and which customer-admin workflows you must build around the APIs.

Seven criteria for evaluating SSO providers

1. Tenant and organization model

The provider must preserve the boundary between customer organizations. Test a user who belongs to two tenants, two customers using the same email domain, and an administrator attempting to configure another tenant’s connection. A successful login must never become proof of authorization to the wrong account.

2. Protocol and identity-provider coverage

List the identity providers your customers use, then map each one to SAML or OIDC. Test SP-initiated SAML, IdP-initiated SAML where customers require it, and the supported OIDC initiation or discovery flow separately. Count tested configurations, not logos on a marketing page.

3. Provisioning and deprovisioning

SSO lets a user reuse an identity-provider authentication across applications; your application or identity platform then establishes its own session. SCIM or another directory-sync mechanism manages lifecycle changes. If customers require automated onboarding and offboarding, test create, update, disable, group and reactivation behavior separately. The SCIM guide explains why tenant-scoped deprovisioning matters.

4. Customer self-service administration

Enterprise connections create recurring setup and certificate-rotation work. Determine which tasks a customer administrator can complete, which require your support team, and which boundaries remain provider-controlled. Inspect audit records for every administrative change.

5. Migration and account linking

Test existing password users who later move to enterprise SSO, domain changes, duplicate email addresses, staged customer rollout and rollback. Document whether the provider links identities automatically, requires an explicit policy or leaves the mapping to your application.

6. Failure and security behavior

Review signing-key rotation, metadata refresh, certificate expiry, clock skew, replay protection, session revocation and provider outages. Measure the complete login path from your production region. Ask who owns the incident when an upstream customer IdP is unavailable.

7. Complete cost

Model your expected MAU or MRU, customer organizations, SSO connections, SCIM or directory connections, environments, custom domains, support and SLA requirements. A provider with a low user price can still cost more for a connection-heavy B2B product. Published billing units are inputs to the model, not directly comparable prices.

SSO proof-of-concept checklist

• Connect one SAML IdP and one OIDC IdP used by real target customers.
• Test SP-initiated SAML, IdP-initiated SAML where required, and the supported OIDC initiation or discovery flow separately.
• Verify tenant resolution before granting application access.
• Test one user who belongs to multiple customer organizations.
• Rotate a certificate or signing key without breaking unrelated tenants.
• Disable one tenant membership without disabling the person globally.
• Exercise SCIM or directory provisioning if it is part of the purchase.
• Confirm which configuration tasks a customer administrator can perform.
• Measure end-to-end login latency and document outage behavior.
• Calculate the production price using your real user, connection and environment counts.

Making the decision

Give engineering ownership of tenant resolution, protocol behavior, latency and failure tests. Security should review key rotation, audit evidence and administrative boundaries. Product should validate the customer-admin workflow and migration experience. Procurement should price the complete user, connection, environment and support bill.

For each finalist, retain a working tenant test, an audit record, a captured failure result and a priced bill of materials. Those artifacts make the decision reviewable after the demo. If a full B2B CIAM platform is the right operating model, compare the evidence with Frontegg SSO and SCIM and its implementation documentation.