Alternatives to 2FAS
Open source 2FA with browser extension approvals
2FAS ranks #1 of 10 in Authenticator apps, with an Alt Score of 85. It is licensed under GPL-3.0, free and available on iOS, Android and Browser extension. 8 of 9 checklist rows are verified against a public source.
Anyone who wants to secure their online accounts with two-factor authentication without creating an account or trusting a third-party server with their secrets — from privacy-conscious individuals to developers who want an open-source, auditable option.
2FAS generates standard TOTP codes for your accounts, working fully offline with all data stored locally on your device. It supports encrypted backups to iCloud or Google Drive (or manual export) so you don't lose access if you switch phones, plus organizational features like groups, custom icons, and browser extension pairing for desktop login. The app is free and open-source, with no account registration or personal data collection required.
You add an account by scanning its QR code or entering its setup key, and 2FAS stores the secret locally and generates a new 6-digit code every 30 seconds. When logging in, you open the app and enter the current code alongside your password; encrypted backup can restore all entries on a new device.
Where 2FAS stands out
Verified capabilities most alternatives don't have.
Why people leave 2FAS
Dashed reasons are sourced facts; the rest are opinions. Vendors can dispute.
Sign in to add a reason — new reasons go through moderation before appearing.
Ranked alternatives
Ordered by Alt Score. Click any score to see the breakdown.
Feature comparison
How 2FAS compares with its alternatives, feature by feature.
| Authenticator apps checklist | 2FAS | Stratum | 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 2FAS is verified against its own pages. Each alternative is sourced on its own page.
-
Pricing model Free verified 2026-07-11
100% free
https://2fas.com/auth/ -
License GPL-3.0 verified 2026-07-11
GNU GENERAL PUBLIC LICENSE
https://github.com/twofas/2fas-android/blob/main/LICENSE -
Platforms iOS, Android, Browser extension verified 2026-07-11
Requirement: iOS 16.4 or later
https://2fas.com/download/ -
Status active verified 2026-07-11
Latest
https://github.com/twofas/2fas-android/releases -
TOTP Yes verified 2026-07-11
time-based one-time passwords (TOTP)
https://github.com/twofas/2fas-android/blob/main/README.md -
Encrypted backup Yes verified 2026-07-11
In addition to standard security and our end-to-end encryption, data can be encrypted with your password, so we encourage you to do that.
https://2fas.com/support/2fas-auth-security-privacy/is-2fas-backup-safe/ -
Multi-device sync Yes verified 2026-07-11
Cloud synchronization (iOS – iCloud, Android – Google Drive) found in the menu or settings, 2FAS Backup.
https://2fas.com/support/2fas-auth-mobile-app/how-to-use-sync-more-devices-with-2fas/ -
Browser extension Yes verified 2026-07-11
Add 2FAS Auth to your web browser by installing our extension for Chrome, Brave, Firefox, Edge, Opera and Safari.
https://2fas.com/auth/browser-extension/ -
Apple Watch / Wear OS Partial verified 2026-07-11
Yes, 2FAS Auth supports Apple Watches.
https://2fas.com/support/2fas-auth-mobile-app/do-you-support-apple-watch/ -
Import from other apps Yes verified 2026-07-11
If you have been using Google Authenticator and want to move to our app, you can simply transfer your codes using 'Transfer accounts' in the Google Auth app, and scan the exported QR code with the 2FA
https://2fas.com/support/2fas-auth-mobile-app/how-can-i-move-transfer-tokens-codes-from-another-app-to-2fas/ -
Export allowed Yes verified 2026-07-11
Export," and save the file on your device."
go to Settings/Menu, 2FAS Backup, tap
https://2fas.com/support/2fas-auth-mobile-app/i-want-to-move-copy-transfer-tokens-codes-between-ios-and-android/ -
Open source Yes verified 2026-07-11
Source code for 2FAS Auth Android app
https://github.com/twofas/2fas-android
FAQ
Yes. Stratum, Ente Auth and Aegis Authenticator have a free tier or are fully free. Free-tier limits in the comparison table are verified and dated.
Stratum, Ente Auth and Aegis Authenticator — every license claim links its source.