FreeOTP is a two-factor authentication application for systems utilizing one-time password protocols. Tokens can be added easily by scanning a QR code.

FreeOTP implements open standards:

• HOTP (HMAC-Based One-Time Password Algorithm) RFC 4226
• TOTP (Time-Based One-Time Password Algorithm) RFC 6238

This means that no proprietary server-side component is necessary: use any server-side component that implements these standards.

• F-Droid
• Google Play

Pull requests on GitHub are welcome under the Apache 2.0 license, see CONTRIBUTING for more details.

The FreeOTP app uses the following permissions

Here are some open-source alternative apps providing similar functionality:

• Aegis
• FreeOTP+
• Proton Authenticator