Best Enterprise SSO & SCIM Platforms for B2B SaaS: Top 5
The SSO and SCIM overlay category: adding enterprise login and provisioning to a product that already has its own authentication.
For a B2B SaaS product that already has working authentication, the enterprise-readiness gap is narrow and specific: SAML or OIDC single sign-on and SCIM directory provisioning, the two features that unblock procurement once a deal reaches security review. The five platforms below are ranked for exactly that overlay use case, not for teams building authentication from scratch.
Scores follow our 10-dimension rubric and editorial judgment, adjusted for fit to this specific use case rather than each vendor's general-purpose score. Each pick links to a full vendor profile. See the broader best CIAM for B2B SaaS ranking for platforms that replace core auth entirely, and identity for B2B SaaS for the architecture behind the choice.
The established overlay: SAML/OIDC SSO and SCIM Directory Sync on top of auth you already have.
WorkOS is the reference implementation of the overlay model, composable APIs for enterprise SSO, Directory Sync, an Admin Portal your customers configure themselves, and audit logs, without replacing your existing login. The largest reference base in this category and the broadest directory-connector coverage.
Best for: B2B SaaS with its own auth that needs proven enterprise SSO and SCIM fast
Watch out: Per-connection pricing from the first connection, no free allowance
The fastest, cheapest way to ship SAML, OIDC, and SCIM on a first enterprise deal.
SSOJet covers the same overlay ground as WorkOS, SAML and OIDC inbound federation plus SCIM provisioning, at lower published per-connection rates, with dedicated private-cloud deployment and multi-region data residency on its Enterprise plan. A 2024 entrant, so the reference base is thinner.
Best for: Startups shipping enterprise SSO under budget and time pressure
Watch out: Shorter track record; fewer public references than WorkOS
SSO connections as an add-on to a full CIAM platform, if you want the platform too.
Auth0's Essentials and Professional plans bundle a handful of Enterprise SSO connections with per-MAU pricing, then charge per additional connection. It is the right choice when you want the connections and the underlying authentication platform in one vendor, and overkill when you only need the overlay.
Best for: Teams wanting one platform for both core auth and enterprise SSO
Watch out: Retail plans cap at 30 connections; above that it is custom Enterprise pricing
Flat-tier pricing and a self-hosted Community edition, if the overlay model doesn't fit your budget shape.
FusionAuth prices in flat monthly tiers rather than per-connection, which reads well once you have enough enterprise customers that per-connection billing gets expensive, and its free self-hosted Community edition removes the connection question entirely for teams willing to run it themselves.
Best for: Teams wanting predictable flat pricing or a self-hosted option
Watch out: Cloud tiers are a bigger jump in cost than a pure per-connection model
Free, self-hosted SAML and OIDC federation, if you can staff running it.
Keycloak provides mature SAML and OIDC support and realms for multi-tenancy at zero license cost, self-hosted under Apache 2.0. It is not an overlay in the API sense, you run the identity provider yourself, but it removes per-connection billing entirely for teams with the operational capacity.
Best for: Engineering-heavy teams that want zero license cost and full control
Watch out: You own scaling, upgrades, and availability; no vendor SLA without paid support
At a glance
| # | Vendor | Score | Best for |
|---|---|---|---|
| 1 | WorkOS | 4.5/5 | B2B SaaS with its own auth that needs proven enterprise SSO and SCIM fast |
| 2 | SSOJet | 4.2/5 | Startups shipping enterprise SSO under budget and time pressure |
| 3 | Auth0 | 4.3/5 | Teams wanting one platform for both core auth and enterprise SSO |
| 4 | FusionAuth | 3.8/5 | Teams wanting predictable flat pricing or a self-hosted option |
| 5 | Keycloak | 3.9/5 | Engineering-heavy teams that want zero license cost and full control |
Frequently asked questions
- What is the SSO and SCIM overlay category?
- It's B2B SaaS platforms that add enterprise SAML/OIDC single sign-on and SCIM directory provisioning to a product that already has its own core authentication, rather than replacing that authentication. WorkOS and SSOJet are the clearest examples: you keep your existing login and add the overlay only for enterprise customers who require SSO.
- Do I need a full CIAM platform or just an SSO/SCIM overlay?
- If your product already has working authentication and the only gap is enterprise SSO and SCIM for procurement, an overlay like WorkOS or SSOJet is faster and cheaper than adopting a full CIAM platform. If you're building authentication from scratch or want B2C and B2B in one vendor, a full platform like Auth0 makes more sense.
- Is self-hosting SCIM and SSO with Keycloak cheaper than a managed overlay?
- It removes license and per-connection fees, but not cost: you take on scaling, upgrades, and availability yourself. For teams with the platform engineering capacity, Keycloak is genuinely free at the license level. For teams without it, the operational cost usually exceeds what a managed overlay would have charged.