Is there a free alternative to Auth0?

Yes. The 2 free alternatives are Keycloak (open source, Apache-2.0) and authentik (open source, MIT).

How much does Auth0 cost?

Auth0's B2C Essentials plan costs $35 a month, which is $420 a year (monthly (starting tier)). Source: the official pricing page at auth0.com, checked Oct 17, 2026.

Which Auth0 alternatives run on Linux?

Keycloak (self-hosted server; web UI) and authentik (self-hosted server; web UI).

Can you self-host a Auth0 alternative?

Yes. Keycloak and authentik run on your own server.

Are these Auth0 alternatives open source?

Yes. All 2 use OSI-approved open-source licenses: Keycloak (Apache-2.0) and authentik (MIT).

Free alternatives to Auth0

Swap Auth0 for Keycloak or authentik and stop paying $420/yr.

2open source2run on Linux2self-hostable

Prices and project data checked Oct 17, 2026 · How we check

$420/yr B2C Essentials Verified on auth0.com, Oct 17, 2026

2 alternatives

Keycloak

Self-hosted server About Keycloak →

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.

authentik

Self-hosted server About authentik →

Open source · MIT Linux Self-hostable

goauthentik/authentik25.9k★last push Oct 12, 2026checked Oct 17, 2026

Self-host

Runs on your own Linux server. Setup docs are on goauthentik.io.

At a glance

Free alternatives to Auth0 compared
Alternative	License	Linux	AUR	Self-host	Stars
Keycloak	Apache-2.0 open source	Yes	—	Yes	37.3k★
authentik	MIT open source	Yes	—	Yes	25.9k★

Auth0 alternatives: questions

Is there a free alternative to Auth0?: Yes. The 2 free alternatives are Keycloak (open source, Apache-2.0) and authentik (open source, MIT).
How much does Auth0 cost?: Auth0's B2C Essentials plan costs $35 a month, which is $420 a year (monthly (starting tier)). Source: the official pricing page at auth0.com, checked Oct 17, 2026.
Which Auth0 alternatives run on Linux?: Keycloak (self-hosted server; web UI) and authentik (self-hosted server; web UI).
Can you self-host a Auth0 alternative?: Yes. Keycloak and authentik run on your own server.
Are these Auth0 alternatives open source?: Yes. All 2 use OSI-approved open-source licenses: Keycloak (Apache-2.0) and authentik (MIT).

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