I recently put together a deep-dive on the top Single Sign-On (SSO) providers for 2025. It is not just a list — we broke down key features like SAML/OIDC/SCIM support, pricing, use cases (startups vs enterprise), developer experience, and even included a checklist + questions to ask vendors.

If you’re building a SaaS product or just exploring SSO options, this might save you a few hours of research.