Stratum

A free open-source two factor authentication app for Android. It features encrypted backups, icons, categories and a high level of customisation. It also has a Wear OS companion app.

It supports TOTP (Time Based) and HOTP (Counter Based) authenticators using either SHA1, SHA256 or SHA512 hashing algorithms. Mobile-Otp (mOTP), Steam and Yandex are also supported.

Features:

?? Compatibility: Stratum is compatible with most providers and accounts. 💾 Backup / Restore: Backup your authenticators with strong encryption. In case you lose your or change phone, you can always gain access to your accounts. Save to cloud storage or to your device. 🌙 Dark Mode: Stratum has a beautiful material design inspired look in either light or dark themes. ?? Icons: Find your authenticators easily with recognisable brand logos and icons next to each code. 📂 Categories: Organise your authenticators into categories. 🔒 Offline with few permissions: Stratum only requires a single permission and does not require Internet access to function. 🎨 Customisation: Set icons and rename. You can also arrange your authenticators in any order you like so you can find them easily. ? Wear OS: Quickly view your authenticators directly from your watch. Please note that a connection to your Android device is required.