Keycloak
Open Source Identity and Access Management For Modern Applications and Services.
37.6k GitHub stars · Apache-2.0 · last code push Oct 29, 2026 · GitHub · Website
Open-source and self-hosted alternatives to Auth0
Logins, single sign-on and user management. Keycloak is the long-standing standard; the others are newer and often easier to set up.
Category: Login & identity · GitHub data as of Oct 29, 2026 · FAQ · Cost & self-hosting
| Project | What it is | License | GitHub stars | Last release | Runs as | Hosted plan |
|---|---|---|---|---|---|---|
| Keycloak Active Apache-2.0 | Open Source Identity and Access Management For Modern Applications and Services. | Apache-2.0 | 37.6k | Oct 29, 2026 | Self-hosted web app | Not confirmed |
| Authelia Active Apache-2.0 | The Single Sign-On Multi-Factor portal for web apps. OpenID Certified™ and Post-Quantum Cryptography Ready. | Apache-2.0 | 29.4k | Sep 17, 2026 | Self-hosted web app | Not confirmed |
| authentik Active Mixed or custom | An identity provider for single sign-on (SSO), multi-factor login and user management. | Mixed or custom | 26.2k | Oct 21, 2026 | Self-hosted web app | Not confirmed |
| ZITADEL Active AGPL-3.0 | An identity and access management platform for adding login, SSO and user management to apps. | AGPL-3.0 | 15.5k | Oct 22, 2026 | Self-hosted web app | Yes, from the project |
Are they still maintained?
4 of 4 Auth0 alternatives here had a code push or release in the last 180 days (checked Oct 29, 2026).
- Keycloak: active, last activity Oct 29, 2026 (0 days ago)
- Authelia: active, last activity Oct 29, 2026 (0 days ago)
- authentik: active, last activity Oct 29, 2026 (0 days ago)
- ZITADEL: active, last activity Oct 29, 2026 (0 days ago)
See every project in the "Is it still maintained?" tracker →
What switching from Auth0 costs
Auth0: current plans and prices are on Auth0's pricing page.
| Alternative | How you run it | Software cost | What you pay for |
|---|---|---|---|
| Keycloak | Your server | $0 (Apache-2.0) | A server you rent or own, plus your time for updates and backups. |
| Authelia | Your server | $0 (Apache-2.0) | A server you rent or own, plus your time for updates and backups. |
| authentik | Your server | $0 (Mixed or custom, check terms) | A server you rent or own, plus your time for updates and backups. |
| ZITADEL | Your server, or the project's hosted plan | $0 (AGPL-3.0) | A server you rent (or own), or the project's paid hosted plan. |
Self-hosting basics: Keycloak, Authelia, authentik and ZITADEL need a server, which can be a small cloud server or a spare machine at home. For a sense of scale, DigitalOcean's price list shows a 1 GiB server at $6/month and 2 GiB at $12/month (checked Oct 29, 2026). Check each project's documented requirements before choosing a size, and budget time for updates and backups.
Don't want to run a server? ZITADEL offers a hosted plan run by the project itself. Prices change, so check each project's site.
License check: authentik does not use a single standard open-source license that GitHub can detect. Read the license before using it in a business.
The options in more detail
Authelia
The Single Sign-On Multi-Factor portal for web apps. OpenID Certified™ and Post-Quantum Cryptography Ready.
29.4k GitHub stars · Apache-2.0 · last code push Oct 29, 2026 · GitHub · Website
authentik
An identity provider for single sign-on (SSO), multi-factor login and user management.
26.2k GitHub stars · Mixed or custom · last code push Oct 29, 2026 · GitHub · Website
ZITADEL
An identity and access management platform for adding login, SSO and user management to apps.
15.5k GitHub stars · AGPL-3.0 · last code push Oct 29, 2026 · GitHub · Website
Auth0 alternatives: common questions
What is the best open-source alternative to Auth0?
It depends on how you use Auth0. Of the 4 options here, Keycloak is the most followed on GitHub (37.6k stars) and is actively maintained, with its latest release on Oct 29, 2026.
Is there a self-hosted Auth0 alternative?
Yes. Keycloak, Authelia, authentik and ZITADEL run on a server you control, so your data stays with you. If you'd rather not run a server, ZITADEL also offers a hosted plan from the people who make it.
Is there a free alternative to Auth0?
Yes. Every project on this page can be downloaded and used at no cost from its public repository. Server apps are free software, but you pay for the server they run on. Check the license of authentik before using it in a business.
Are these Auth0 alternatives still maintained?
As of Oct 29, 2026, 4 of 4 had a code push or release in the last 180 days. None are flagged as inactive or archived. We re-check every project weekly.
How much does it cost to switch from Auth0?
The software itself is free. For server apps, the main cost is hosting: as a reference point, DigitalOcean lists a 1 GiB server at $6/month and a 2 GiB server at $12/month (checked Oct 29, 2026). Check each project's documented requirements before choosing a size. The hidden cost is time: moving your data and, for self-hosted apps, keeping up with updates and backups.
Are all of these really open source?
Not all under a standard license. authentik: GitHub could not identify a single standard license for this repository (often a mix of open-source and commercial parts). Read the LICENSE file before using it. The others use OSI-approved open-source licenses.
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