Supabase Auth

Supabase Auth is an open-source authentication platform built on the battle-tested GoTrue project, designed to be a complete drop-in replacement for Firebase Authentication with additional flexibility. Unlike proprietary solutions, Supabase Auth can be self-hosted on your own infrastructure, giving you full control over your authentication system and user data. This open-source approach resonates strongly with developers who value transparency, portability, and the freedom to fork or modify their auth infrastructure as needed.

For solo entrepreneurs, Supabase Auth presents a powerful option because it integrates seamlessly with PostgreSQL through row-level security (RLS), enabling you to define access control rules directly in your database. This means complex authorization patterns—such as multi-tenant applications, role-based access control, or data-specific permissions—can be implemented without additional middleware or API layers. The free tier includes unlimited users, so you never pay for authentication volume, only for database compute and storage if you choose to use Supabase's hosted platform.

Key capabilities include traditional email/password authentication, OAuth integration with major providers (Google, GitHub, Apple, Discord, etc.), passwordless magic link authentication, comprehensive multi-factor authentication options, and SAML SSO for enterprise customers. The platform is fully API-driven with excellent SDKs for JavaScript, Python, and other languages. Whether you self-host for maximum control or use Supabase's managed platform for convenience, Supabase Auth removes the burden of building authentication from scratch while maintaining transparency and flexibility that proprietary alternatives cannot match.