Alternatives to Stratum
Open source authenticator with wearable support
Stratum ranks #2 of 10 in Authenticator apps, with an Alt Score of 75. It is licensed under GPL-3.0, free and available on Android. 7 of 9 checklist rows are verified against a public source.
Android users who want a private, open-source two-factor authentication app with no cloud lock-in — people who value auditable security and full control over their accounts and backups.
Stratum (formerly Authenticator Pro) generates TOTP, HOTP, and Mobile-OTP codes for your accounts, storing them in an encrypted, biometric-protected local vault. You can organize accounts into categories with recognizable service icons, and create encrypted backups for import/export across devices. A Wear OS companion app syncs codes to your watch for offline access, and the app runs entirely on-device with no internet permission required.
Add an account by scanning a QR code or entering its secret key, and Stratum generates rolling one-time codes locally following the RFC 6238/4226 standards. Codes refresh automatically (every 30 seconds for TOTP), and can also be viewed on a paired Wear OS watch.
Where Stratum stands out
Verified capabilities most alternatives don't have.
Why people leave Stratum
Dashed reasons are sourced facts; the rest are opinions. Vendors can dispute.
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Ranked alternatives
Ordered by Alt Score. Click any score to see the breakdown.
Feature comparison
How Stratum compares with its alternatives, feature by feature.
| Authenticator apps checklist | Stratum | 2FAS | Ente Auth | Aegis Authenticator | Authy | Duo Mobile |
|---|---|---|---|---|---|---|
| Pricing model | ||||||
| Starts at | ||||||
| License | ||||||
| Platforms | ||||||
| TOTP | ||||||
| Encrypted backup | ||||||
| Multi-device sync | ||||||
| Browser extension | ||||||
| Apple Watch / Wear OS | ||||||
| Import from other apps | ||||||
| Export allowed | ||||||
| Open source | ||||||
| Push-based approvals |
Every fact and feature listed for Stratum is verified against its own pages. Each alternative is sourced on its own page.
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License GPL-3.0 verified 2026-07-11
GNU GENERAL PUBLIC LICENSE
https://github.com/stratumauth/app/blob/master/LICENSE -
Pricing model Free verified 2026-07-11
Download the open-source Stratum app for free
https://stratumauth.com/download -
Platforms Android verified 2026-07-11
Two-Factor Authentication (2FA) client for Android + Wear OS
https://github.com/stratumauth/app -
Status active verified 2026-07-11
@jamie-mh released this 08 May 10:56
https://github.com/stratumauth/app/releases -
TOTP Yes verified 2026-07-11
Stratum supports TOTP, HOTP, mOTP, Steam and Yandex which covers most
https://github.com/stratumauth/app/wiki/Frequently-Asked-Questions -
Encrypted backup Yes verified 2026-07-11
AES_GCM with no padding. The key is derived using Argon2id
https://stratumauth.com/wiki/backup-format -
Multi-device sync Partial verified 2026-07-11
Syncing to cloud services would require the internet permission and heavy intrusive SDKs
https://github.com/stratumauth/app/wiki/Frequently-Asked-Questions -
Apple Watch / Wear OS Yes verified 2026-07-11
Two-Factor Authentication (2FA) client for Android + Wear OS
https://github.com/stratumauth/app -
Import from other apps Yes verified 2026-07-11
It depends on if the app supports exporting your data to a file.
https://github.com/stratumauth/app/wiki/Frequently-Asked-Questions -
Export allowed Yes verified 2026-07-11
A Python tool can be used to decrypt your backups.
https://stratumauth.com/wiki/backup-format -
Open source Yes verified 2026-07-11
A free open-source two factor authentication app for Android.
https://github.com/stratumauth/app/blob/master/README.md
FAQ
Yes. 2FAS, Ente Auth and Aegis Authenticator have a free tier or are fully free. Free-tier limits in the comparison table are verified and dated.
2FAS, Ente Auth and Aegis Authenticator — every license claim links its source.