Supabase Auth
Authentication and user management built into the Supabase platform with social login, MFA, and Row Level Security integration.
Use Cases
Free Tier
50K MAU, social OAuth, MFA, email/password, anonymous sign-ins
How to Maximize the Free Tier
Supabase Auth's 50K MAU free tier is one of the most generous hosted auth offerings. Pair it with Supabase's free PostgreSQL database and Row Level Security for end-to-end auth without external services. Use anonymous sign-ins for public-facing apps where you want user data without forcing registration. The free tier limits audit logs to 1 hour and doesn't include SAML SSO — save those features for the Pro plan. Watch the 2 active projects limit on the free plan; create a staging and production project, not separate dev environments.
Getting Started
Sign up at supabase.com → create a new project → go to Authentication > Providers → enable email/password and social providers (Google, GitHub) → copy your project URL and anon key → install @supabase/supabase-js → initialize the client → add signIn/signUp calls → enable Row Level Security policies for data access control.
Pros
- 50K MAU free: One of the most generous free auth tiers — 5x Clerk's 10K limit with no credit card required
- Database integration: Auth is natively integrated with Supabase's Postgres database via Row Level Security policies — no middleware needed
- Full platform: Auth comes with database, storage, edge functions, and real-time subscriptions — a complete backend on the free tier
Cons
- Platform lock-in: Tightly coupled to Supabase — migrating auth to another provider means rewriting your entire data access layer
- Inactivity pause: Free projects pause after 1 week of inactivity — you'll need periodic manual wake-ups for dormant projects
- Limited audit logs: Only 1 hour of auth audit logs on the free plan — insufficient for compliance or debugging login issues