Tofu

Tofu Authenticator for iOS is a reliable and user-friendly two-factor authentication app designed to protect your online accounts. Its key features include scanning QR codes to add accounts, searching accounts by name, and supporting both counter-based and time-based one-time passwords with 6 or 8 digits using the SHA1, SHA256, and SHA512 algorithms. The app requires no network or cellular connection and stores account details securely in the iOS keychain. Tofu works with services that provide two-factor authentication using the HOTP and TOTP algorithms, such as Google, Facebook, Dropbox, Amazon, and GitHub. By using Tofu, you can prevent unauthorized access to your accounts, even if your password is compromised. The app is open-source and free, licensed under the ISC license, and its source code is available for review and modification. To prevent being locked out of your account if you lose access to your iPhone, online services provide backup or recovery codes during the setup process, which can be used instead of the one-time passwords generated by Tofu. Accounts in Tofu are also included in iOS backups, allowing you to restore them on a new iPhone using a password-protected backup made with iTunes or Finder on the Mac.