Open Source Auth Alternatives
Browse open source auth alternatives for login, identity, SSO, user management, and self-hosted auth.
Products tracked
9
Alternative pages
4
Open-source products
5
Search
Search within Auth
Use scoped search to jump straight to a product page or open source tool inside auth.
Try searching for a commercial target like Google Analytics, an open source option like PostHog, or a category like auth.
Ranked comparison pages
Best “alternative to” pages in Auth
Auth0
Authentication and identity platform.
Popular hosted identity platform for login, auth flows, and user management.
Clerk
Developer-focused auth and user management.
Hosted auth product with polished developer workflows and UI components.
Firebase Auth
Authentication for Firebase apps.
Hosted auth service that integrates closely with the Firebase ecosystem.
Okta
Enterprise identity and access management.
Enterprise IAM platform used for workforce identity, SSO, and access management.
Category guidance
How to use this hub well
The most useful way to navigate a category like auth is to separate the pages people search for from the open source products they may end up choosing. The ranked pages above answer high-intent queries like “open source alternatives to X,” while the open source products below help you spot recurring options that appear across multiple comparisons.
That split matters because the best open source product is not always the best replacement for every incumbent. Some tools are strongest as self-hosted platforms, others win on privacy, some are more developer-centric, and some are only a close fit for specific workflows. This category page is built to make those patterns easier to recognize quickly.
Open-source products
Reusable options that show up across this category
Supabase Auth
Authentication in the Supabase stack.
Managed auth service that integrates with Supabase database and backend tooling.
Keycloak
Open source identity and access management.
Open source IAM system with SSO, identity brokering, and user federation.
ZITADEL
Open source identity infrastructure.
Identity and access platform with open source core and strong support for modern auth workflows.
Authentik
Open source identity provider.
Open source identity solution for login, SSO, and access workflows.
SuperTokens
Open source authentication for modern apps.
Open source auth stack focused on app authentication, sessions, and modular login recipes.