head to head · open source
Keycloak vs fido2-net-lib
Keycloak has 36,876 GitHub stars, 8,945 forks, 3,292 open issues and last shipped today. fido2-net-lib has 1,452 stars, 202 forks, 20 open issues and last shipped 2 days ago. Keycloak leads on adoption by 2,440% (36,876 vs 1,452 stars). Keycloak is written in Java under Apache-2.0; fido2-net-lib is written in C# under MIT. Keycloak has attracted 24% as many forks as stars, fido2-net-lib 14%. 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 | fido2-net-lib | |
|---|---|---|
| GitHub stars | ★ 37K | ★ 1.5K |
| License | Apache-2.0 | MIT |
| Written in | Java | C# |
| Last push | 2026-09-20 | 2026-09-18 |
| Forks | ⑂ 8.9K | ⑂ 202 |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick Keycloak if
- You weight community size — 37K 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 fido2-net-lib if
- You want the fido2-net-lib feature set and don't need the biggest community
- You prefer the MIT license terms
- Your stack matches C#
- You evaluated both and fido2-net-lib fits your workflow better
About Keycloak
Keycloak is an open source identity and access management server, written in Java and licensed under Apache 2.0, that adds authentication and access control to applications and services, and it is intended for teams and organisations that want to own their user store rather than rent one.
read the full Keycloak overview →
About fido2-net-lib
fido2 net lib is an open source, MIT licensed C library that provides a FIDO2 server and WebAuthn relying party implementation for .NET, aimed at developers who want passkey registration and sign in in ASP.NET Core, .NET Core and native .NET applications without writing the credential validation logic themselves.
read the full fido2-net-lib overview →
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Frequently asked questions
Is Keycloak or fido2-net-lib more popular?
Keycloak has 36,876 GitHub stars and fido2-net-lib has 1,452. Keycloak has the larger community by that measure.
Are Keycloak and fido2-net-lib free?
Both are open source. Keycloak is licensed under Apache-2.0 and fido2-net-lib under MIT. Neither carries a licence fee.
What is the difference between Keycloak and fido2-net-lib?
Keycloak is written in Java and fido2-net-lib in C#. 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 fido2-net-lib?
Choose Keycloak if you want the larger community (36,876 stars) or its Apache-2.0 licence terms. Choose fido2-net-lib if its feature set, stack or MIT licence fits better. Both are self-hostable.