Clerk
Developer-first authentication with beautiful pre-built components for React, Next.js, and other frameworks.
FreemiumAuthentication
Keycloak
Open-source identity and access management platform with SSO, SAML 2.0, OIDC, and LDAP/AD federation — self-hosted, no per-user pricing.
Open SourceAuthentication
Auth0
Enterprise-grade authentication platform with extensive social providers, MFA, and single sign-on capabilities.
FreemiumAuthentication
Supabase Auth
Open-source authentication service integrated with PostgreSQL RLS, part of the Supabase platform.
FreemiumAuthentication
Firebase Auth
Google's authentication service with deep integration across Firebase platform and extensive mobile SDK support.
FreemiumAuthentication
BetterAuth
Open-source TypeScript authentication framework that runs inside your app — email/password, social OAuth, passkeys, multi-tenancy, and SSO with no per-user pricing.
Open SourceAuthentication