# Best Enterprise SSO & SCIM Platforms for B2B SaaS: Top 5

Source: https://startwithidentity.com/rankings/best-sso-scim-platforms-b2b-saas/
Last updated: 2026-08-06
License: content by Start with Identity. Cite the source URL.

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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](https://startwithidentity.com/methodology/) 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](https://startwithidentity.com/rankings/best-ciam-for-b2b-saas/) ranking for platforms that replace core auth entirely, and [identity for B2B SaaS](https://startwithidentity.com/articles/identity-for-b2b-saas/) for the architecture behind the choice.