Authentication
Identity management, SSO, and user authentication platforms
Open Source Alternatives
Free and open source tools in this category.
Keycloak
Open source identity and access management — Auth0 alternative
Authentik
Open source identity provider with modern UI and flows
Logto
Developer-friendly open source identity solution
Proprietary Tools
Commercial software in this category. Click to see open source alternatives.
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Keycloak, Authentik, Logto, and SuperTokens: open source Auth0 alternatives — enterprise authentication without enterprise pricing in 2026 Free options covered.
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