#4 in Authentication Free tier From Free
Lucia
TypeScript-first auth library you self-host.
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About Lucia
Lightweight auth library that gives you the primitives. No vendor, no fees, no monthly active user caps. Code lives in your repo.
Features
MAU Unlimited (self-hosted)
Cost Free (MIT license)
Session Management Built-in
OAuth Providers Bring your own
Database Adapters Many (Postgres, MySQL, SQLite, etc.)
UI Components No (BYO)
Hosting Self-hosted
Open Source Yes (MIT)
Free tier limits
Unlimited users (self-hosted, free forever)