Open Authenticator
Open Authenticator is a cross-platform TOTP manager for protecting accounts with two-factor authentication.
What Open Authenticator is
Open Authenticator is a cross-platform TOTP manager for protecting accounts with two-factor authentication. It works with services such as Google, GitHub, and Discord, and synchronizes authentication codes across Android, iOS, macOS, Windows, and Linux. Backups are encrypted before transmission with a key derived from a master password. The backend can be self-hosted. The maker says the app has no ads, tracking, or data collection, while its source code is public under the GNU GPL v3 license. Community contributors provide translations. The Free plan is free and covers five supported platforms. Backend sign-in providers can include Google, Apple, GitHub, Microsoft, and email. Self-hosting requires Node.js, pnpm, a compatible database, and compatible storage; email and key-value storage are optional. The backend is still in development, with documented limits of six TOTPs for regular users and 100 for contributor users.
Good
- Supports Android, iOS, macOS, Windows, and Linux
- Encrypted backups and multi-device synchronization
- No ads, tracking, or data collection stated
- GPL v3 public source code
- Self-hosted backend option
Watch out
- Backend is still in development
- Self-hosting requires several server components
- Default regular-user limit is six TOTPs
- LLM-style provider sign-in options require configuration
Who it suits
It suits people managing two-factor authentication across several desktop and mobile platforms. It also fits users who want open-source software, encrypted synchronization, or a self-hosted backend.
Verdict
Open Authenticator combines cross-platform TOTP management with encrypted synchronization and public source code. Consider the developing backend and documented TOTP limits before choosing a self-hosted setup.
Plans and prices
From Open Authenticator's own pricing page, checked 9 Oct 2026.
| Plan | Price | What it gives you |
|---|---|---|
| Free | Free | Free and open-source · five supported platforms |
The facts
Each one read from Open Authenticator's own pages, with the date it was checked.
What it does
- Backend development
- The backend repository says the backend is still in development.checked 9 Oct 2026
- Backend sign-in
- The backend documents Google, Apple, GitHub, Microsoft, and email as configurable authentication providers.checked 9 Oct 2026
- Code type
- totpchecked 21 Sep 2026
- Compatibility
- It works with services that support two-factor authentication, including Google, GitHub, and Discord.checked 9 Oct 2026
- Encrypted backup
- Yeschecked 21 Sep 2026
- Encryption
- Data is encrypted before transmission using a key derived from a master password.checked 9 Oct 2026
- License
- The source code is public under the GNU GPL v3 license.checked 9 Oct 2026
- Privacy
- The maker says the app has no ads, tracking, or data collection.checked 9 Oct 2026
- Purpose
- Open Authenticator is a cross-platform TOTP manager for protecting accounts with two-factor authentication.checked 9 Oct 2026
- Self-hosting requirements
- Self-hosting requires a Node.js environment, pnpm, a compatible database, and compatible storage; email and key-value storage are optional.checked 9 Oct 2026
- Sync
- The app synchronizes TOTPs across devices, and its backend can be self-hosted.checked 9 Oct 2026
- TOTP limit
- The backend configuration documents a default limit of six TOTPs for regular users and 100 for contributor users.checked 9 Oct 2026
- Translations
- The app is multilingual, with translations contributed by the community.checked 9 Oct 2026
Money
- Free plan
- Yeschecked 21 Sep 2026
Where it runs
- Multi-device sync
- Yeschecked 21 Sep 2026
- Platforms
- The maker lists Android, iOS, macOS, Windows, and Linux as supported platforms.checked 9 Oct 2026
- Supported platforms
- Android,iOS,macOS,Windows,Linuxchecked 21 Sep 2026
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