Stratum
A free and open-source two-factor authentication app for Android with encrypted backups and Wear OS support.
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About Stratum
Stratum, formerly known as Authenticator Pro, is a two-factor authentication app for Android. It generates TOTP, HOTP and mOTP codes, supports icons, categories and a good deal of customisation, and has a companion Wear OS app.
Codes stay on the device and the app does not talk to remote servers. Backups are protected with strong encryption, and you can import accounts from other authenticator apps and export them at any time. The project is community-run with no corporate ties and is released under the GPL 3.0 license.
Strengths
- Encrypted backups with import from other apps and export at any time
- Supports TOTP, HOTP and mOTP
- Wear OS companion app
- No server communication or data lock-in
Limitations
- Android only, with no iOS or desktop version
- Only handles one-time codes, not passwords
Details
- Pricing
- FreeFree and open source under the GPL 3.0 license.
- License
- GPL-3.0
- Developer
- The Stratum contributors
- Platforms
- Android
- How it runs
- Downloadable app
- Account
- Not required
- Works offline
- Yes
- Best suited for
- Android users who want a private authenticator they can back up and migrate
- Categories
- Password managers, Security tools
- Last verified
- Added
- Provenance
- Facts checked against the developer's own pages and store listings, 1 sources on file.
Alternatives to Stratum
Compare allSoftware that can replace Stratum for an important use case, and what changes if you switch.
Aegis Authenticator
An encrypted two-factor authentication app for Android with real backups and imports from every other authenticator.
Aegis Authenticator is also an open-source Android app with an encrypted vault, automatic backups and many imports, but lacks the Wear OS companion and mOTP support.
2FAS
Open-source authenticator app with browser-extension push approvals.
2FAS is open source on Android and iOS, adds browser-extension push approvals, and backs up to your own Google Drive or iCloud account.
Ente Auth
Open-source two-factor authenticator with end-to-end encrypted backups.
Ente Auth adds iOS, desktop and web clients with free end-to-end encrypted cloud backup, which relies on an Ente account instead of local files.
Proton Authenticator
A free two-factor authentication app from Proton with end-to-end encrypted sync between your devices and no advertising.
Proton Authenticator is open source and free on Android, Windows and Linux, with end-to-end encrypted sync between devices through a Proton account.
FreeOTP
An open-source two-factor authentication app for Android and iOS that generates one-time codes.
FreeOTP is open source on Android and iOS and available on F-Droid, but its project site offers little documentation and no mention of encrypted backups.
Google Authenticator
Google's mobile app that generates one-time verification codes for two-step verification.
Google Authenticator is closed source on Android and iOS, with optional code sync through a Google Account instead of local encrypted backups.
Authy
Mobile two-factor authenticator with encrypted cloud backup.
Authy is closed source on Android and iOS with encrypted cloud backup and multi-device sync, but ties account recovery to a phone number.
Bitwarden Authenticator
A standalone mobile app from Bitwarden that generates and stores two-step verification codes.
Bitwarden Authenticator is a free closed-source app for Android and iOS from a password manager vendor, with few published details about import, export or backup.
Similar software
Related functionality, not necessarily a direct replacement.
Yubico Authenticator
An app that shows two-factor codes from OATH credentials stored on a YubiKey.
KeePassDX
Android KeePass client with biometric unlock and autofill.
Keepass2Android
An open-source KeePass-compatible password manager for Android with built-in cloud storage sync.
