Open Authenticator

Open Authenticator is a simple, lightweight and convenient OTP (One Time Password) manager for Android. This application built to provide convenient and secure way to store your one-time passwords.

Features:

* Export/Import accounts offline, through encrypted file or QR code;
* Compatibility with Google Authenticator migration format;
* Block access to codes using fingerprint, pin code or other available on device method;
* Support both for TOTP and HOTP algorithms;
* Built-in QR code scanner;
* Light/Night theme.

Source code: https://github.com/Nan1t/Authenticator