Login, sessions and identity for your app.
An open-source authentication library for JavaScript apps, formerly NextAuth.js, supporting OAuth, email, and credentials-based flows.
A hosted authentication and user-management platform offering prebuilt UI components alongside a generous free tier.
Google's managed authentication service supporting email, phone, and federated sign-in, integrated tightly with the rest of Firebase.
The authentication layer of Supabase, providing email, OAuth, and row-level-security-aware sessions on top of Postgres.
An enterprise-grade identity platform offering configurable login flows, SSO, and extensive compliance features for larger applications.