It implements Time-based One-time Passwords (TOTP) and HMAC-Based One-Time Passwords (HOTP). Simply scan the QR code and login with the generated 6-digit code. This project started out as a fork of the great OTP Authenticator app written by Bruno Bierbaumer, which has sadly been inactive since 2015. By now almost every aspect of the app has been changed/re-written so the fork status of the Github repository got detached upon user request. But all credit for the original version and for starting this project still goes to Bruno! Features:

Free and Open-Source Requires minimal permissions Camera access for QR code scanning Storage access for import and export of the database Encrypted storage with two backends: Android KeyStore Password / PIN Multiple backup options: Plain-text Password-protected OpenPGP-encrypted Sleek minimalistic Material Design with three different themes: Light Dark Black (for OLED screens) Great Usability Compatible with Google Authenticator Supported algorithms: TOTP (Time-based One-time Passwords) as specified in RFC 6238 HOTP (HMAC-based One-time Passwords) as specified in RFC 4226