head to head · open source
Keycloak vs authelia
Keycloak has 37,657 GitHub stars, 9,129 forks, 3,292 open issues and last shipped yesterday. authelia has 29,482 stars, 1,531 forks, 137 open issues and last shipped yesterday. Keycloak leads on adoption by 28% (37,657 vs 29,482 stars). Keycloak is written in Java under Apache-2.0; authelia is written in Go under Apache-2.0. Keycloak has attracted 24% as many forks as stars, authelia 5%. Keycloak was the more recently maintained of the two, and both are self-hostable with no licence fee.
Two open source projects, one decision. Both are free and self-hostable — the differences are community size, license terms, language stack and release pace.
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Side by side
| Keycloak | authelia | |
|---|---|---|
| GitHub stars | ★ 38K | ★ 29K |
| License | Apache-2.0 | Apache-2.0 |
| Written in | Java | Go |
| Last push | 2026-11-02 | 2026-11-02 |
| Forks | ⑂ 9.1K | ⑂ 1.5K |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick Keycloak if
- You weight community size — 38K stars and counting
- You want the Apache-2.0 license terms
- Your stack matches Java
- You value the larger contributor base for long-term maintenance
pick authelia if
- You want the authelia feature set and don't need the biggest community
- You prefer the Apache-2.0 license terms
- Your stack matches Go
- You evaluated both and authelia fits your workflow better
About Keycloak
Open Source Identity and Access Management Add authentication to applications and secure services with minimum effort. No need to deal with storing users or authenticating users. Keycloak provides user federation, strong authentication, user management, fine grained authorization, and more. Help and Documentation Documentation User Mailing List Mailing list for help and general questions about Keycloak Join keycloak for general questions, or keycloak dev on Slack for design and development discussions, by creating an account at Reporting Security Vulnerabilities If you have found a security vulnerability, please…
read the full Keycloak overview →
About authelia
<img alt="SLSA 3" src="
read the full authelia overview →
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Frequently asked questions
Is Keycloak or authelia more popular?
Keycloak has 37,657 GitHub stars and authelia has 29,482. Keycloak has the larger community by that measure.
Are Keycloak and authelia free?
Both are open source. Keycloak is licensed under Apache-2.0 and authelia under Apache-2.0. Neither carries a licence fee.
What is the difference between Keycloak and authelia?
Keycloak is written in Java and authelia in Go. The practical differences are community size, licence terms, language stack and release cadence — all compared in the table above.
Which should I choose, Keycloak or authelia?
Choose Keycloak if you want the larger community (37,657 stars) or its Apache-2.0 licence terms. Choose authelia if its feature set, stack or Apache-2.0 licence fits better. Both are self-hostable.