Open-source alternatives to Auth0
Looking to replace Auth0 with something free and open-source? These 3 tools are the best open alternatives in 2026 — most are self-hostable, so you keep full control of your data and pay no subscription.
At a glance: how they compare
Click a column to sort — the best one depends on what matters to you.
| Alternative | Stars | Language | License | Last commit | In one line |
|---|---|---|---|---|---|
| Keycloak | — | — | Apache-2.0 | — | Enterprise-grade identity and access management. |
| Authentik | — | — | MIT | — | Flexible self-hosted identity provider (SSO, SAML, OAuth). |
| SuperTokens | — | — | Apache-2.0 | — | Open-source auth with prebuilt login flows. |
Which one should you pick?
Keycloak
Enterprise-grade identity and access management. Its Apache-2.0 license is permissive — free to use commercially, embed and modify. Because it is self-hostable, your data can stay entirely on your own infrastructure.
Authentik
Flexible self-hosted identity provider (SSO, SAML, OAuth). Its MIT license is permissive — free to use commercially, embed and modify. Because it is self-hostable, your data can stay entirely on your own infrastructure.
SuperTokens
Open-source auth with prebuilt login flows. Its Apache-2.0 license is permissive — free to use commercially, embed and modify. Because it is self-hostable, your data can stay entirely on your own infrastructure.
Switching from Auth0 without the drama
- Export your data from Auth0 first — most tools above can import standard formats.
- Run your top pick in parallel for a week or two before committing; self-hosted options can be tried locally in minutes.
- Migrate one team or one project at a time, keeping the old account read-only until everything checks out.
FAQ
What is the best open-source alternative to Auth0?
The top open-source alternative is Keycloak — Enterprise-grade identity and access management. The full ranked list is above.
Are these Auth0 alternatives free?
Yes. Every tool listed is open-source and free to use; most can be self-hosted so you keep full control of your data.
Can I self-host an alternative to Auth0?
Most of these tools are designed to run on your own server or machine, giving you privacy and no subscription fees.
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