Authentication · Updated 2026
Quick Verdict
Choose Supabase Auth for rapid development of modern web/mobile apps with a built-in PostgreSQL backend. Choose Keycloak for complex enterprise environments requiring a standalone, feature-rich identity provider for microservices and legacy protocols.
Supabase Auth is a streamlined, PostgreSQL-native authentication service designed as a core component of the Supabase BaaS platform, offering a simple developer experience. Keycloak is a full-featured, standalone Identity and Access Management (IAM) server, built on Java, supporting advanced standards like SAML and fine-grained authorization. While both are open-source, Supabase Auth is a managed service with a generous free tier, whereas Keycloak is self-hosted software with no inherent pricing. Supabase targets developers building new apps, while Keycloak targets organizations securing diverse application portfolios.
Side-by-Side Comparison
| Aspect | Supabase Auth | Keycloak |
|---|---|---|
| Pricing | Free managed tier; paid plans for usage | Open-source software; self-hosted cost only |
| Ease of Use | Very high; simple client libraries, integrated dashboard | Moderate to complex; requires setup, configuration, and server management |
| Scalability | Scales with Supabase platform; suitable for most SaaS apps | Highly scalable; designed for large enterprise deployments and clustering |
| Integrations | Excellent for modern OAuth providers and Supabase ecosystem | Extensive; supports OIDC, OAuth 2.0, SAML, LDAP, and social logins |
| Open Source | Yes | Yes |
| Best For | Developers building modern apps with a PostgreSQL backend | Organizations needing a standalone IAM for complex, multi-protocol environments |
Choose Supabase Auth if...
Supabase Auth is ideal when you are building a new application and want a seamless, integrated auth system that works natively with your Supabase PostgreSQL database and real-time features. It's the superior choice for small to mid-sized teams prioritizing developer velocity, a simple API, and a managed service over extensive customization.
Choose Keycloak if...
Keycloak is the better choice for enterprises or large teams that need a centralized, self-hosted identity provider supporting a wide array of protocols (OIDC, OAuth 2.0, SAML) for microservices, legacy systems, and modern apps. It excels in scenarios requiring complex user federation, fine-grained role-based access control (RBAC), and deep customization of the authentication flow and user management UI.
Product Details
Supabase Auth
A complete, open-source authentication and user management system for web and mobile apps.
Pricing
Free
Best For
Developers and teams building modern web or mobile applications who want a powerful, PostgreSQL-native, and open-source authentication backend.
Key Features
Pros
- + Deeply integrated with PostgreSQL and Supabase's real-time/DB tools
- + Generous free tier and transparent, usage-based pricing
- + Open-source and can be self-hosted for full control
Cons
- - Primarily designed for the Supabase ecosystem, less ideal as a standalone service
- - Advanced configuration and self-hosting require deeper DevOps knowledge
- - Fewer built-in enterprise features (like SSO) on lower tiers compared to some competitors
Keycloak
An open-source identity and access management solution for modern applications and services.
Pricing
Open Source
Best For
Development teams and organizations needing a self-hosted, open-source identity provider to secure web applications, microservices, and APIs.
Key Features
Pros
- + Fully open-source with no vendor lock-in
- + Extensive protocol support and high customizability
- + Strong community and commercial backing from Red Hat
Cons
- - Requires technical expertise to deploy and manage
- - Admin UI can be complex for new users
- - Advanced clustering and scaling require careful configuration