2FAS Auth review

2FAS Auth is the pick for people who want an authenticator that never asks who they are. There is no account: 2FAS says use is 100% anonymous and that it does not store passwords or metadata. Tokens live on your device, and you decide whether to back them up to the cloud or export them manually. The app supports both TOTP and HOTP codes, and you can sort tokens into groups with badges, icons and labels. Its most useful extra is the 2FAS browser extension, which lets you send a code from your phone to the browser in one tap instead of typing six digits. There is an Apple Watch app as well, and 2FAS publishes its source code and a cryptography white paper. The limits: there is no full desktop app, codes on a computer go through the extension, and the current iOS release needs iOS 18.6 or later, which older iPhones may not run.

Who it is for

people who want anonymous use plus a browser extension

Price

Free.

all from one app, 100% free!
Quoted from the vendor pricing page on November 13, 2026.

Key features

• No account required, which 2FAS describes as 100% anonymous use
• Cloud and manual backup with control over where tokens are stored
• One-tap sign-in through 2FAS browser extensions
• Apple Watch app on iOS
• TOTP and HOTP codes with groups, badges, icons and labels

Strengths and weaknesses

• Strength: Browser extension sends codes to your computer without typing
• Strength: Works offline and stores no passwords or metadata
• Strength: Open source with a published cryptography white paper
• Weakness: No standalone desktop app; computers use the browser extension
• Weakness: Current iOS version requires iOS 18.6 or later
• Weakness: Backups sync across mobile devices, not to a web app

Key facts

• Price: Free
• Platforms: iOS, Android, Apple Watch, browser extensions
• Account: Not required
• Source code: Open source

Where it ranks

2FAS Auth is No. 3 in our Best Two Factor Authentication Apps verdict.