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github.com/stratumauth/app Password Managers Open-source projectOpen source

Stratum Auth is an Android and Wear OS two-factor authentication client supporting TOTP and HOTP codes, encrypted backups, and account categories.

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github.com/stratumauth/app
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About app

Stratum is a free, open-source two-factor authentication client for Android, distributed with a companion app for Wear OS. It generates TOTP (time-based) and HOTP (counter-based) codes using SHA1, SHA256 or SHA512, and also supports Mobile-OTP (mOTP), Steam and Yandex accounts. Authenticators can be given brand icons, renamed, sorted into categories and arranged in any order.

Backups are encrypted and can be saved to cloud storage or to the device, so accounts remain reachable after losing or changing a phone. The app states it requires a single permission — camera access for adding accounts via QR codes — and does not need Internet access to function. It is currently available only through the F-Droid client via the IzzyOnDroid repository, which must be added first, and APK authenticity can be checked by comparing certificate signatures.

Key features

  • TOTP and HOTP code generation with SHA1, SHA256 or SHA512 hashing
  • Additional support for Mobile-OTP (mOTP), Steam and Yandex accounts
  • Encrypted backup and restore to cloud storage or device
  • Categories, brand icons, renaming and manual ordering of authenticators
  • Wear OS companion app requiring a connection to the Android device
  • One permission (camera for QR scanning); no Internet access needed
Best for: Android users who want an open-source 2FA client with encrypted backups and are comfortable installing it through F-Droid with the IzzyOnDroid repository.
Good for
  • Free and open source under the GPL-3.0 license
  • Encrypted backups allow restoring accounts after losing or changing a phone
  • Stated to need only camera permission and no Internet access to function
Watch out for
  • Currently available only through the F-Droid client after adding the IzzyOnDroid repository
  • The Wear OS app requires a connection to the paired Android device

app at a glance

Type
Open-source project
Pricing
Not confirmed. Check the site
Platforms
Android
Open source
Yes · Source code
Language
English
Last checked
Oct 6, 2026 · Online when checked
Listed
Oct 5, 2026
open sourceandroidpassword management

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app FAQ

Where can I download Stratum?
The project states it is currently only available on the F-Droid client through the IzzyOnDroid repository, which you must add in F-Droid first.
Does Stratum need an Internet connection?
According to the project, it does not require Internet access to function and asks for only one permission: camera access, used to add accounts through QR codes.
Can I back up my authenticators?
Yes. Backups use strong encryption and can be saved to cloud storage or to your device, so you can regain access to accounts if you lose or change phone.
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Listing maintained by Chris McClure and the WebIndexly editors · Updated Oct 11, 2026 · How we rank