Attomus Signet

Offline 2FA. No cloud. Yours.

Only for iPhone

Free · Designed for iPhone. Not verified for macOS.

iPhone

Your 2FA secrets should not be copied to someone else's cloud. Attomus Signet is an offline OTP authenticator for security professionals and teams that want hard boundaries around authentication secrets. • No account. • No cloud sync. • No server copy. • No telemetry. • No analytics SDKs. Signet generates TOTP and HOTP codes on your iPhone. Secrets stay local, protected by iOS Keychain and device security controls. Access is gated by Face ID, Touch ID, or device passcode. Encrypted backups are local files, not a cloud recovery service. Export to an Argon2id + AES-256-GCM encrypted .attomusauth file, choose your own passphrase, and save it where you decide. Attomus cannot read it, cannot sync it, cannot reset it, nor recover it. Built for security-conscious users: • TOTP and HOTP • Standard otpauth:// QR codes • iOS Keychain storage • Face ID, Touch ID, or device passcode gating • Encrypted local backup export and import • App switcher privacy overlay • No registration • No advertising SDKs • No Firebase or tracking SDKs • No network requests for OTP generation, storage, export, or import Signet is for people who do not want their authenticator to become another account, another sync service, or another third party in the trust chain. Your codes. Your device. Your boundary.

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Signet now accepts shorter TOTP secrets to accommodate providers that don't use the recommended key length from RFC 4226.

Version 1.1.1

The developer, Attomus Limited, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .

  • Data Not Collected

    The developer does not collect any data from this app.

    Privacy practices may vary, for example, based on the features you use or your age. Learn More

    Accessibility

    The developer has not yet indicated which accessibility features this app supports. Learn More

    Information

    Seller
    • Attomus Limited
    Size
    • 3.5 MB
    Category
    • Utilities
    Compatibility
    Requires iOS 16.0 or later.
    • iPhone
      Requires iOS 16.0 or later.
    • Mac
      Requires macOS 13.0 or later and a Mac with Apple M1 chip or later.
    • Apple Vision
      Requires visionOS 1.0 or later.
    Languages
    • English
    Age Rating
    4+
    Copyright
    • © 2026 Attomus Ltd
  • Developer Website
  • Privacy Policy