replacing Auth0

Open Source Auth0 Alternatives

Identity and access management platform — Auth0 pricing: $35-$240/month. Below: 3 free, self-hostable open source projects that cover the same ground, ranked by real GitHub adoption.

There are 3 open source Auth0 alternatives tracked on this registry, against Auth0 pricing of $35-$240/month. The most-adopted is Keycloak with 37,657 GitHub stars under Apache-2.0, written in Java. Together the set has 78,703 stars across 3 languages and 2 licences. All 3 are free to self-host with no licence fee, and 3 of 3 received a commit in the last 90 days. 3 head-to-head Auth0 comparisons are available.

Auth0's free tier caps at 25,000 MAU. Essentials at $35/month adds basics. Every login costs money as you scale. No self-hosted option.

Our top 3 Auth0 alternatives

Keycloak ★ 38K

Keycloak is a server that handles authentication and access control for applications and services. The README frames the proposition plainly: add authentication to applications and secure services with minimum effort, with no need to deal with storing users or authenticating users. It lives in the cloud-native ecosystem as a Cloud Native Computing Foundation project, which is visible in its CNCF Code of Conduct, its community Slack hosted at slack.cncf.io, and its CLOMonitor listing under the cncf project path. The project carries OpenSSF Best Practices, OpenSSF Scorecard, and Artifact Hub badges, and it is organised as a family of repositories: the Keycloak server and Java adapters, Keycloak Client libraries, Keycloak QuickStarts, and Keycloak Node.js Connect.

Apache-2.0 · Java · Auth0 vs Keycloak →

Authentik ★ 26K

Authentik is an open-source Identity Provider (IdP) built for modern single sign-on (SSO) workflows. It operates in the identity and access management (IAM) ecosystem, offering a self-hosted alternative to commercial solutions like Auth0, Okta, and Entra ID. The project is written in Python and distributed under a mixed MIT/CC BY-SA/enterprise license model, with a core open-source offering and an enterprise tier for advanced features and support.

NOASSERTION · Python · Auth0 vs Authentik →

Logto ★ 15K

Logto is an open-source authentication and authorization infrastructure for SaaS and AI applications. It is written in TypeScript, licensed under MPL-2.0, and positioned as an open alternative to Auth0. The project sits in the identity and access management ecosystem, where it provides a central service for login, consent, tokens, user directories, and access control.

MPL-2.0 · TypeScript · Auth0 vs Logto →

Keycloak ★ 38K

Secure authentication and access control made simple

rank001 licenseApache-2.0 written inJava

Authentik ★ 26K

Take control of your identity with a secure, flexible solution

rank002 licenseNOASSERTION written inPython

Logto ★ 15K

Secure, seamless authentication for modern applications

rank003 licenseMPL-2.0 written inTypeScript

last updated nightly · ranking method: github stars, live-tracked

Frequently asked questions

What is the best open source alternative to Auth0?

Keycloak is the most-starred open source alternative to Auth0 in this registry, with 37,657 GitHub stars. 3 alternatives are compared here in total.

Are there free alternatives to Auth0?

Yes. Every project listed on this page is open source and free to self-host — there is no licence fee. Some projects also sell a managed hosted version, but the self-hosted path costs nothing.

What should I look at when replacing Auth0?

Compare licence terms, community size (stars), primary language and release activity. A fast-moving project with a compatible licence and an active maintainer base matters more than raw star count when you are committing to a migration.