Developer ToolsSupabase
The open-source Firebase alternative — Postgres database, Auth, Storage, Edge Functions, and Realtime in one platform
Developer Tools
Developer ToolsBetter Auth
The most comprehensive TypeScript authentication framework — free, open-source, and production-ready
Developer ToolsClerk
Full-Stack Auth & User Management for Developers — Launch in Minutes
SecurityStack Auth
The open-source Auth0 & Clerk alternative — 5-minute Next.js setup, 10,000 MAU free, MIT + AGPLv3.
SecurityKinde
All-in-one auth, billing and feature flags for modern SaaS — 10,500 MAU free, SOC 2 + ISO 27001 certified.
SecurityZITADEL
Open-source, multi-tenant identity infrastructure with SSO, MFA, passkeys, and an event-sourced audit trail.
SecurityStytch
Developer-first identity platform with passwordless auth, passkeys, SSO, fraud prevention and AI-agent identity in a single API.
SecurityLogto
Open-source auth infrastructure with multi-tenancy, SSO, and RBAC built on OIDC and OAuth 2.1.