Supabase AuthvsClerk
TL;DR
Supabase Auth ships with your database, integrates with RLS, and is free at any reasonable scale. Clerk is the polished specialist, superior UI components, mature SSO, multi-tenant orgs. Pick Supabase Auth if you want one platform; pick Clerk if auth is a first-class concern of your business.
Bundled-with-Postgres workflow
Supabase Auth
Polished pre-built UI components
Clerk
Enterprise SSO + SCIM
Clerk
RLS-as-authz primitive
Supabase Auth
| Feature | Supabase Auth | Clerk |
|---|---|---|
| Database integration | JWT claims in Postgres GUCs (auth.uid) | Webhook sync to your DB |
| Pre-built UI | Auth UI library (basic) | <SignIn /> + <UserButton /> polished |
| Social providers | 20+ | 30+ |
| Magic links + OTP | Yes | Yes |
| Organizations / teams | Roll-your-own with RLS | First-class Organizations API |
| Enterprise SSO (SAML/OIDC) | Pro tier | Standard feature |
| MFA | TOTP | TOTP + SMS + backup codes |
| Pricing | Free up to 100k MAU | Free up to 10k MAU, then per-MAU |
| Vendor lock-in | Portable (GoTrue is open) | Higher (proprietary) |
When Supabase Auth wins
- You're building on Supabase anyway and want RLS to read user claims directly. Supabase's
auth.uid()+request.jwt.claimspattern is the cleanest authz primitive in the industry. - You don't want to pay for auth as a separate line item. 100k MAU free is generous.
- You're a solo founder or small team and the bundled experience is what you want.
- You value the open-source angle. GoTrue is portable; you can self-host or move.
When Clerk wins
- Auth is a first-class concern. You want SAML, SCIM, advanced session controls, organizational structures, and Clerk's polish.
- You're building B2B with multi-tenant orgs. Clerk's Organizations API is more mature than rolling your own membership tables.
- Your team will appreciate the pre-built UI components. The Clerk components save real engineering time.
- You're willing to pay for the convenience. Clerk pricing is fair; it's just not free.
The hybrid pattern
It's viable to use Clerk for auth and Supabase for everything else. Clerk emits a JWT; you wire it into Supabase via a custom JWT secret or by webhook-syncing user rows. The trade-off: you lose the clean RLS integration unless you write a custom Postgres function to extract Clerk claims. Doable, but a bit more glue.
Honest take
For most projects on Supabase, Supabase Auth is the right call. The RLS integration is the killer feature you don't want to fight. For projects where auth is non-trivial - enterprise SSO, complex org models, end-user-facing auth UIs. Clerk earns its keep. The two products are sized for different jobs; pick on shape, not on benchmarks.