Top Free Alternatives to Auth0
Stop paying expensive subscriptions for Authentication tools. Discover the best free and open-source replacements for Auth0.
Why switch from Auth0?
Auth0's pricing jumps exponentially once you cross their free tier limits, especially for B2B applications requiring SAML or SSO. Open-source auth providers include SSO out of the box.
SuperTokens
Open source alternative to Auth0 / Firebase Auth / AWS Cognito.
Key Features
- Session management
- Social login
- Passwordless
- Multi-tenant SSO
Pros
- + You own your user data
- + Highly customizable frontend
- + Excellent documentation
Cons
- - Self-hosting requires maintaining a separate database for auth
- - Less robust B2B directory sync than Auth0
Keycloak
Open Source Identity and Access Management.
Key Features
- Single-Sign On
- Identity Brokering
- User Federation
- Standard Protocols
Pros
- + Enterprise-grade security
- + Supported by Red Hat
- + Incredibly feature-rich
Cons
- - Heavyweight Java application
- - UI is complex and dated
- - Hard to customize the login theme
BoxyHQ
Enterprise Readiness made simple
Key Features
- 100% data control
- Self-hostable
- No vendor lock-in
- Community-driven
Pros
- + Ownership of your data
- + Flexible and customisable
- + Cost-effective
Cons
- - Requires server setup
- - Smaller commercial support
Cerbos
Granular access control
Key Features
- 100% data control
- Self-hostable
- No vendor lock-in
- Community-driven
Pros
- + Ownership of your data
- + Flexible and customisable
- + Cost-effective
Cons
- - Requires server setup
- - Smaller commercial support
FusionAuth
User authentication and session management framework
Key Features
- 100% data control
- Self-hostable
- No vendor lock-in
- Community-driven
Pros
- + Ownership of your data
- + Flexible and customisable
- + Cost-effective
Cons
- - Requires server setup
- - Smaller commercial support
Hanko
Passkey-first authentication framework
Key Features
- 100% data control
- Self-hostable
- No vendor lock-in
- Community-driven
Pros
- + Ownership of your data
- + Flexible and customisable
- + Cost-effective
Cons
- - Requires server setup
- - Smaller commercial support
OPAL (Permit.io)
Authorization administration framework (Open Policy)
Key Features
- 100% data control
- Self-hostable
- No vendor lock-in
- Community-driven
Pros
- + Ownership of your data
- + Flexible and customisable
- + Cost-effective
Cons
- - Requires server setup
- - Smaller commercial support
Ory
Identity platform
Key Features
- 100% data control
- Self-hostable
- No vendor lock-in
- Community-driven
Pros
- + Ownership of your data
- + Flexible and customisable
- + Cost-effective
Cons
- - Requires server setup
- - Smaller commercial support
Oso
Authorization building framework
Key Features
- 100% data control
- Self-hostable
- No vendor lock-in
- Community-driven
Pros
- + Ownership of your data
- + Flexible and customisable
- + Cost-effective
Cons
- - Requires server setup
- - Smaller commercial support
Warrant
Authorization and access control as a service
Key Features
- 100% data control
- Self-hostable
- No vendor lock-in
- Community-driven
Pros
- + Ownership of your data
- + Flexible and customisable
- + Cost-effective
Cons
- - Requires server setup
- - Smaller commercial support
Zitadel
User authentication and session management framework
Key Features
- 100% data control
- Self-hostable
- No vendor lock-in
- Community-driven
Pros
- + Ownership of your data
- + Flexible and customisable
- + Cost-effective
Cons
- - Requires server setup
- - Smaller commercial support