Free authentication providers compared
Monthly active user limits and catches on free auth plans, including backend platforms that bundle auth.
Dedicated auth
| Service | Free tier (from official page) | Status |
|---|---|---|
| Clerkauth | 50,000 MRU per app·unlimited apps·up to 3 dashboard seats·100 MRO orgs per app·5 impersonations/mo | |
| Auth0auth | up to 25,000 MAU·1 custom domain (card verification)·unlimited social connections·5 organizations·1,000 M2M | card for custom domain |
Backends with built-in auth
| Service | Free tier (from official page) | Status |
|---|---|---|
| Supabasebackend | unlimited API requests·50,000 MAU·500 MB database·shared CPU / 500 MB RAM·5 GB egress·5 GB cached egress·1 GB file storage·paused after 1 week inactivity | pauses when idle |
| Appwritebackend | 2 projects·75K MAU·5 GB API bandwidth/mo·2 GB storage·750K function executions/mo·500K DB reads/mo, 250K writes/mo·1 org member·project freezes (read-only) at limits | |
| Firebasebackend | no-cost, no payment method·1 GiB Firestore storage·50,000 Firestore reads/day·20,000 Firestore writes/day·20,000 Firestore deletes/day·10 GiB Firestore outbound/mo·10 GiB/mo App Hosting outbound·5 GB App Hosting storage | no card needed |
Every row links to its service page and official source. Spot an error? Tell us.
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