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.

What should I ask an SSO and SCIM vendor in security review?

Ask for the SOC 2 Type II report or ISO 27001 certificate itself and its audit period, the list of identity providers tested for SCIM, data residency options, and breach notification terms. You buy the overlay to pass your customers' security reviews, so it has to pass yours first.

Ranking · segment · 8 min

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.

By SWI Community Team · Updated 2026-10-16Scored on our 10-dimension rubric

For a B2B SaaS product that already has working authentication, the enterprise-readiness gap is narrow: SAML or OIDC single sign-on and SCIM provisioning, the two features that unblock procurement once a deal reaches security review. The five platforms below are ranked for that overlay use case, not for teams building authentication from scratch.

How we ranked

Cost per enterprise customer. Overlays usually charge per connection, and SSO and SCIM can count separately. Multiply by your expected enterprise customer count over three years, not by this quarter's pipeline.

Customer self-service. Your customer's IT admin should configure the SAML or SCIM connection without a support ticket. A setup portal saves engineering time on every deal.

Directory coverage. SCIM implementations differ by identity provider. Ask which directories are tested, not how many integration guides exist.

The vendor's own security review. You buy an overlay to pass your customers' security reviews, so it has to pass yours. Ask for the SOC 2 report or ISO certificate itself.

Applied to this category

WorkOS is the reference overlay: SSO, Directory Sync, an Admin Portal your customers configure themselves, and audit logs. It charges per SSO connection from the first one, starting at 125 dollars on a volume ladder, with no free connection allowance. SSOJet covers the same ground with a free tier for unlimited users and lower published per-connection prices, but SDKs are JavaScript and TypeScript only, and SOC 2, ISO 27001 and HIPAA appear as Enterprise-plan attributes rather than published attestations, so request documentation. Auth0 makes sense only if you also want it as your core login. FusionAuth prices per instance rather than per connection or user, with a free community edition and first-class multi-tenancy. Keycloak is free under Apache 2.0, with realms for tenant separation and paid support through the Red Hat build if you need an SLA.

Quick picker by scenario

First enterprise deal, need the established option: WorkOS.
Budget-constrained JavaScript team: SSOJet, after checking its documentation against your customers' questionnaires.
No working auth yet: Auth0, or start from CIAM for B2B SaaS.
Dozens of enterprise customers and per-connection bills climbing: FusionAuth.
Platform team, zero license budget: Keycloak.

Where to go next

For the build, read the SCIM provisioning implementation guide and implementing SSO. For the vendor detail, see WorkOS vs SSOJet vs Auth0, WorkOS vs SSOJet and SCIM provisioning tools. For the architecture behind the choice, see identity for B2B SaaS.

WorkOS4.5/5 overall

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

Read the full WorkOS review →

SSOJet4.2/5 overall

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

Read the full SSOJet review →

Auth04.3/5 overall

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

Read the full Auth0 review →

FusionAuth3.8/5 overall

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

Read the full FusionAuth review →

Keycloak3.9/5 overall

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

Read the full Keycloak review →

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.
What should I ask an SSO and SCIM vendor in security review?: Ask for the SOC 2 Type II report or ISO 27001 certificate itself and its audit period, the list of identity providers tested for SCIM, data residency options, and breach notification terms. You buy the overlay to pass your customers' security reviews, so it has to pass yours first.

Last reviewed October 16, 2026By SWI Community TeamSuggest a correction How we research

Independent and community-driven, no sponsorship. Rankings reflect ourcapability rubricand editorial judgment. See the fullrankings indexand head-to-head comparisons.