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2FAS is a set of apps for
TOTP 2-factor authentication.
Google has a
TOTP Authenticator app for iOS and Android,
but Authenticator does not (so far as I know)
forward authentications to Windows Chrome browser,
unlike Google's PassKey solution.
24 Aug 2025
I use 2FAS, which sadly does not yet offer PassKey authentication.
While their statements strain credibility (and trust):
- "easiest way to enable two-factor authentication"
- "world’s most secure, private, and simple 2FA app"
- "We reserve the right, in our sole discretion, to change, modify,
add
or remove portions of this Privacy Policy at any time,
without prior notice to you"
... 2FAS offers a browser extension
that can automagically paste
codes generated by user interaction with their smartphone app.
This sustains
two-factor paradigm, unlike other 2FA browser plugins.
Not having to retype smartphone TOTP code into PC browser
is IMO a significant benefit.
- procedures are not so simple (IMO) as claimed
- 2FAS revisions may have altered specific user interactions
- iOS version changes and general Apple-ness confound usage
- No idea how 2FAS works on Android; automatic synchronization
between Android and iOS devices seems unlikely.
IMO
- 2FA without a backup device is insane.
- Most smartphones are too large to pocket,
liable to being misplaced, damaged and/or lost.
- iPhone sync to iPad is possible via iCloud,
but problematic because iOS.
- Beyond 2FA keys sync,
iOS app instances must be separately configured.
- Configure PIN, but NOT biometric
authentication on backup device,
in case someone else needs to use 2FAS on the backup device.
- SnapDrop is good for transferring 2FAS backups.
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