1 SaaS tool · 6 OSS alternatives · 128,179★ combined
Self-hosting authentication pays off when your team has the operational bandwidth and your usage justifies the engineering time. Below are the 1 authentication SaaS tracked in our database, each with curated OSS alternatives and migration notes. Read the comparison notes on individual SaaS pages — they call out the specific feature gaps you'll hit when switching.
Auth0 (now Okta Customer Identity Cloud) is a managed identity platform providing authentication, authorization, and user management via hosted login flows, social connections, and multi-factor authentication. It is used by apps that want to delegate auth complexity — implementing OIDC, SAML, and social login without building it — with a management dashboard and API for user data.
6 OSS projects across 1 SaaS tool, with a combined 128,179★ on GitHub. Each SaaS page links its top 3 alternatives with stars, language, license, and migration tips.
Maturity varies. We sort alternatives by GitHub stars on each SaaS page, but stars are a community-size signal, not a quality signal. Always check the last-pushed date and recent issue activity before depending on a project — a 50,000★ repo with no commits in 18 months is a red flag.
The migration tips are AI-generated summaries based on the OSS project's documentation and known SaaS export formats. They cover the predictable gotchas (data shape, API differences, authentication) but they are not a substitute for a proper migration runbook. Treat them as a checklist starting point, not a complete plan.