head to head · open source
Bitwarden vs 2FAS
Bitwarden has 20,554 GitHub stars, 1,826 forks, 230 open issues and last shipped yesterday. 2FAS has 1,561 stars, 133 forks, 125 open issues and last shipped 3 days ago. Bitwarden leads on adoption by 1,217% (20,554 vs 1,561 stars). Bitwarden is written in C# under a custom or non-standard licence; 2FAS is written in Kotlin under GPL-3.0. Bitwarden has attracted 9% as many forks as stars, 2FAS 9%. Bitwarden 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
| Bitwarden | 2FAS | |
|---|---|---|
| GitHub stars | ★ 21K | ★ 1.6K |
| License | Custom / other | GPL-3.0 |
| Written in | C# | Kotlin |
| Last push | 2026-11-02 | 2026-10-31 |
| Forks | ⑂ 1.8K | ⑂ 133 |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick Bitwarden if
- You weight community size — 21K stars and counting
- You want the Custom / other license terms
- Your stack matches C#
- You value the larger contributor base for long-term maintenance
pick 2FAS if
- You want the 2FAS feature set and don't need the biggest community
- You prefer the GPL-3.0 license terms
- Your stack matches Kotlin
- You evaluated both and 2FAS fits your workflow better
About Bitwarden
The Bitwarden Server project contains the APIs, database, and other core infrastructure items needed for the "backend" of all bitwarden client applications. The server project is written in C using .NET Core with ASP.NET Core. The database is written in T SQL/SQL Server. The codebase can be developed, built, run, and deployed cross platform on Windows, macOS, and Linux distributions. Developer Documentation Please refer to the Server Setup Guide in the Contributing Documentation for build instructions, recommended tooling, code style tips, and lots of other great information to get you started. Deploy You can…
read the full Bitwarden overview →
About 2FAS
Open Source 2FAS for Android This is the official Android app for the Open Source 2FAS project. What is 2FAS? 2FAS (Two Factor Authentication Service) is a user authentication method that provides an additional layer of security for online accounts. In addition to a username and password, 2FAS uses a second factor, such as a one time password (OTP) shown on a user's phone, to verify a user's identity. This helps prevent unauthorized access to accounts, even if a password is compromised. Features Support for time based one time passwords (TOTP) and HMAC based on time passwords (HOTP) Compatible with any service…
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Frequently asked questions
Is Bitwarden or 2FAS more popular?
Bitwarden has 20,554 GitHub stars and 2FAS has 1,561. Bitwarden has the larger community by that measure.
Are Bitwarden and 2FAS free?
Both are open source. Bitwarden has no licence declared in this registry, and 2FAS is licensed under GPL-3.0. Both are free to self-host.
What is the difference between Bitwarden and 2FAS?
Bitwarden is written in C# and 2FAS in Kotlin. The practical differences are community size, licence terms, language stack and release cadence — all compared in the table above.
Which should I choose, Bitwarden or 2FAS?
Choose Bitwarden if you want the larger community (20,554 stars) or its Custom / other licence terms. Choose 2FAS if its feature set, stack or GPL-3.0 licence fits better. Both are self-hostable.