Best AI tools for adding login/auth
Ranked by fit for most people. Prices checked against official pages.
| Tool | Best for | Skill | Free tier | Paid from | The catch |
|---|---|---|---|---|---|
| Clerk | Drop-in auth UI and user management | beginner | Yes (up to 50K users) | $20/mo annual src 2026-10-13 | Costs grow with monthly active users |
| Supabase | Postgres database + auth + storage, default backend for AI builders | beginner | Yes (projects pause when inactive) | $25/mo src 2026-10-13 | Free projects pause after inactivity |
| Auth0 | Enterprise-grade auth and SSO | dev | Yes (up to 25K MAU) | $35/mo src 2026-10-13 | Gets expensive past free tier |
| Better Auth | Free open-source TypeScript auth library | dev | Free open-source library | unknown (paid infra offering not verified) src 2026-10-13 | You host and maintain it |