2FAS Auth

What 2FAS Auth is

2FAS Auth is a free authenticator that generates two-factor authentication tokens for verifying identity when signing in to online accounts. It supports TOTP and HOTP codes, works offline, and can send push approval requests. Mobile apps are available for iOS and Android, and browser extensions are offered for Chrome, Brave, Firefox, Edge, Opera, and Safari. To connect an extension, pair it with the mobile app by scanning a QR code; token requests are confirmed in the app. Communication between the phone and browser extension is end-to-end encrypted, with no fallback to an unencrypted connection. Users can synchronize tokens with 2FAS export files, iCloud, or Google Drive, and encrypted backup is available. The app does not require an account, describes itself as anonymous, and says it does not use tracking codes. Its source code is open-source and can be reviewed by independent security experts. Support includes a Help Center and a dedicated Discord channel, and the app supports 16 languages. The download page lists iOS 18.6 or later and Android 9.0 or later. The maker is Two Factor Authentication Service, Inc., which lists an address in Henderson, Nevada. The free plan is supported by donations.

Who it suits

2FAS Auth suits people who want a free authenticator for online account sign-ins across a phone and supported browser extensions. It may also suit users who value offline access, open-source code, and token synchronization through export files, iCloud, or Google Drive.

Getting started

1. Visit https://2fas.com/auth/.
2. Download the mobile app for iOS 18.6 or later, or Android 9.0 or later.
3. Install the browser extension for Chrome, Brave, Firefox, Edge, Opera, or Safari if needed.
4. Pair the extension with the mobile app by scanning its QR code.
5. Confirm token requests in the app.
6. Synchronize tokens with 2FAS export files, iCloud, or Google Drive if desired.

Verdict

Choose 2FAS Auth if you want a free, open-source authenticator that works offline and connects to supported browser extensions. Its setup depends on a compatible mobile app for pairing and confirming extension token requests.