What does Keycloak replace?

Keycloak is a free alternative to Auth0 ($420/yr).

Is Keycloak open source?

Yes. Keycloak is licensed under Apache-2.0, an OSI-approved open-source license.

Yes (self-hosted server; web UI).

Yes. Keycloak is a server app you run on your own server.

A free, open-source alternative to Auth0. Switching saves $420/yr at list price.

Checked Oct 17, 2026 · How we check

Self-hosted server

Open source · Apache-2.0 Linux Self-hostable

keycloak/keycloak37.3k★last push Oct 14, 2026checked Oct 17, 2026

Self-host

Runs on your own Linux server. Setup docs are on keycloak.org.

What does Keycloak replace?: Keycloak is a free alternative to Auth0 ($420/yr).
Is Keycloak open source?: Yes. Keycloak is licensed under Apache-2.0, an OSI-approved open-source license.
Does Keycloak run on Linux?: Yes (self-hosted server; web UI).
Can you self-host Keycloak?: Yes. Keycloak is a server app you run on your own server.