Stratum

A free, open-source Android authenticator, formerly Authenticator Pro, with encrypted backups and Wear OS support.

Verified facts: 5 of 5
Alternatives ranked: 4
Approved reviews: 0
Visits sent from here: 0

About Stratum

Stratum, previously called Authenticator Pro, is a community-run open-source two-factor app for Android. It supports TOTP, HOTP, mOTP, Steam and other code types, protects the database with a password and biometrics, and makes encrypted backups you can store wherever you like. It imports from many other authenticators and lets you export at any time, so nothing is locked in. Brand icons, categories, custom ordering, density settings and Material You theming help keep long lists manageable. A Wear OS companion shows codes on your watch, synced from the phone, which few authenticators offer. The app needs only a single permission and no internet access, and the project says it has no corporate ties. It is free, licensed under GPL-3.0, and distributed through Google Play, F-Droid and GitHub. It runs only on Android, so there is no iOS or desktop version, and like Aegis it relies on you to manage backups rather than syncing through a cloud.

Best for: Android users who want an offline, open-source authenticator with a smartwatch app.

What works

Wear OS companion app
Encrypted backups and broad import support
Works without internet access
Free and open source

Why people leave

Android only
No cloud sync between devices
Rename from Authenticator Pro can confuse searches

Top Stratum alternatives

See all 4

1
Aegis Authenticator
The best-known open-source Android vault, with automatic backups.
66.5
2
FreeOTP+
Simpler open-source Android option with Google Drive backups.
62.6
3
Ente Auth
Encrypted sync across phone, desktop and web.
59.6
4
2FAS Auth
Open-source app on both Android and iOS with a browser extension.
57.2

Why people left Stratum

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Stratum: common questions

Is Stratum free?

Yes. Stratum is free, open-source software.

Is Stratum open source?

Yes. The source code is on GitHub at stratumauth/app.

What platforms does Stratum run on?

Stratum is available for Android.

What are the best alternatives to Stratum?

The highest-ranked Stratum alternatives right now are Aegis Authenticator, FreeOTP+ and Ente Auth. See the full ranked list for pricing, platforms and verified facts.

See all 4 Stratum alternatives

Stratum facts

5 of 5 verified

License: GPL-3.0; Checked Oct 25, 2026github.com(opens source in a new tab); “License: GPL-3.0 (GNU General Public License v3.0).”
Former name: Authenticator Pro; Checked Oct 25, 2026stratumauth.com(opens source in a new tab); “Stratum (formerly Authenticator Pro)”
Wear OS: Yes; Checked Oct 25, 2026stratumauth.com(opens source in a new tab); “even a Wear OS app .”
Offline: No internet access needed; Checked Oct 25, 2026stratumauth.com(opens source in a new tab); “does not require Internet access to function”
Code types: TOTP, HOTP, mOTP and more; Checked Oct 25, 2026stratumauth.com(opens source in a new tab); “Compatibility Stratum is compatible with most providers and accounts using TOTP, HOTP, mOTP and more”