Stratum
Use Stratum, an open-source Android app for generating two-factor authentication codes, with encrypted backups, account categories, and a Wear OS companion app.
About Stratum
Stratum is a free two-factor authentication (2FA) app for Android, described on its homepage as open-source and released under the GPL 3.0 license with publicly auditable source code. It generates rolling 2FA codes for accounts supporting TOTP, HOTP, mOTP and related protocols, with no internet access required to function.
The app includes encrypted backup and restore for authenticator data, account categorisation, customisable display density and accent colours, and a Wear OS companion app that syncs codes from a paired Android device for offline watch access. It does not communicate with remote servers, and users can export their full authenticator database at any time.
Key features
- Generates TOTP, HOTP, mOTP and other 2FA codes
- Encrypted backup and restore for authenticator data
- Offline functionality with no internet access required
- Account categorisation for easier code selection
- Customisable display density and accent colours
- Wear OS companion app for watch access
Best for: Privacy-conscious Android users seeking a self-contained, open-source two-factor authentication app.
Good for
- Open-source code released under GPL 3.0, publicly auditable for security
- No remote server communication, keeping all authenticator data local
- Includes encrypted backups and offline functionality for reliable access
Watch out for
- Wear OS companion app requires a connection to a paired Android device
- Compatibility is limited to most TOTP, HOTP, mOTP providers, not all
- No support for non-Android mobile platforms is mentioned
Stratum at a glance
- Website
- stratumauth.com
- Category
- Privacy & Security › Password Managers
- Type
- Website
- Pricing
- Not confirmed. Check the site
- Platforms
- Android, Web
- Open source
- Not stated
- Language
- English
- Last checked
- Oct 6, 2026 · Online when checked
- Listed
- Oct 5, 2026
Guides for Password Managers
Stratum alternatives
Tools and sites you could use instead, ranked by how closely they match.
Stratum Auth is an Android and Wear OS two-factor authentication client supporting TOTP and HOTP codes, encrypted backups, and account categories.
Open source
24 alternatives
Ente Auth provides cross-platform two-factor authentication with end-to-end encrypted cloud backups for account tokens.
FreeOpen source
24 alternativesTofu, an iOS authenticator, that adds accounts by scanning issuer QR codes and generates time-based or counter-based one-time passwords offline.
Yubico Authenticator is a desktop and Android companion app for managing YubiKeys and accessing one-time passwords.
Use 2FAuth, a web app, to manage two-factor authentication accounts and generate security codes.
Open source
24 alternatives
Store passwords and two-factor authentication tokens locally with 2FAS, which offers mobile apps and a browser extension.
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Stratum FAQ
Does Stratum require internet access to generate 2FA codes?
No, it only requires a single permission and functions fully offline.
Can I import my existing 2FA accounts from other apps?
Yes, the app supports easy import from supported alternative authenticator apps.
What is needed to use the Wear OS companion app?
It requires a connection to a paired Android device to sync the authentication database.
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