Developer tools · Updated October 2026
Auth0 is Okta's hosted service for login, sign-up, and user identity. If you would rather own your tools, here are 7 open source alternatives to Auth0, ranked by GitHub stars. Each one is free to use under its license, and you can read, change, and often self-host the code.
The most popular is Keycloak with 37.5k stars, and the most recently updated is authentik, with a commit on Oct 21, 2026.
| Project | Stars | License | Language | Last commit |
|---|---|---|---|---|
 Keycloak | 37.5k | Apache-2.0 | Java | Oct 21, 2026 |
 Better Auth | 30.4k | MIT | TypeScript | Oct 21, 2026 |
 authentik | 26k | Other | Python | Oct 21, 2026 |
 ZITADEL | 15.4k | AGPL-3.0 | Go | Oct 21, 2026 |
 SuperTokens | 15.3k | Other | Java | Oct 20, 2026 |
 Logto | 14.7k | MPL-2.0 | TypeScript | Oct 21, 2026 |
 Ory Kratos | 13.9k | Apache-2.0 | Go | Jul 29, 2026 |
by keycloak
Open Source Identity and Access Management For Modern Applications and Services
by better-auth
The most comprehensive authentication framework
by goauthentik
The authentication glue you need.
by zitadel
ZITADEL - Identity infrastructure, simplified for you.
by supertokens
Open source alternative to Auth0 / Firebase Auth / AWS Cognito
by logto-io
🧑🚀 Authentication and authorization infrastructure for SaaS and AI apps, built on OIDC and OAuth 2.1 with multi-tenancy, SSO, and RBAC.
by ory
Headless cloud-native authentication and identity management written in Go. Scales to a billion+ users. Replace Homegrown, Auth0, Okta, Firebase with better UX and DX. Passkeys, Social Sign In, OID…
By GitHub stars, Keycloak is the most popular open source alternative to Auth0 right now, with 37.5k stars, followed by Better Auth and authentik. The best fit depends on your setup, so compare their licenses, languages, and recent activity in the table above.
Yes. All 7 projects on this page are open source, so the software itself is free to use, study, and change. Some of them also sell a hosted version or paid support.
authentik (last commit Oct 21, 2026), Keycloak (last commit Oct 21, 2026), and Logto (last commit Oct 21, 2026) have the most recent commits. Licenses on this list include Apache-2.0, MIT, AGPL-3.0, and MPL-2.0.
