Open Authenticator

Spec sheet

Purpose

Open Authenticator is a cross-platform TOTP manager for protecting accounts with two-factor authentication.Read 9 Oct 2026 · openauthenticator.app

Platforms

The maker lists Android, iOS, macOS, Windows, and Linux as supported platforms.Read 9 Oct 2026 · openauthenticator.app

Free plan

YesRead 21 Sep 2026 · openauthenticator.app

Privacy

The maker says the app has no ads, tracking, or data collection.Read 9 Oct 2026 · openauthenticator.app

License

The source code is public under the GNU GPL v3 license.Read 9 Oct 2026 · openauthenticator.app

Backend development

The backend repository says the backend is still in development.Read 9 Oct 2026 · github.com

Backend sign-in

The backend documents Google, Apple, GitHub, Microsoft, and email as configurable authentication providers.Read 9 Oct 2026 · github.com

Code type

totpRead 21 Sep 2026 · openauthenticator.app

Compatibility

It works with services that support two-factor authentication, including Google, GitHub, and Discord.Read 9 Oct 2026 · openauthenticator.app

Encrypted backup

YesRead 21 Sep 2026 · openauthenticator.app

Encryption

Data is encrypted before transmission using a key derived from a master password.Read 9 Oct 2026 · openauthenticator.app

Multi-device sync

YesRead 21 Sep 2026 · openauthenticator.app

Self-hosting requirements

Self-hosting requires a Node.js environment, pnpm, a compatible database, and compatible storage; email and key-value storage are optional.Read 9 Oct 2026 · github.com

Supported platforms

Android,iOS,macOS,Windows,LinuxRead 21 Sep 2026 · openauthenticator.app

Sync

The app synchronizes TOTPs across devices, and its backend can be self-hosted.Read 9 Oct 2026 · openauthenticator.app

TOTP limit

The backend configuration documents a default limit of six TOTPs for regular users and 100 for contributor users.Read 9 Oct 2026 · github.com

Translations

The app is multilingual, with translations contributed by the community.Read 9 Oct 2026 · openauthenticator.app

Plans and prices

Every Open Authenticator plan and price →

Where Specifiction places it

• Authenticator apps#31 of 1118.3