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    Open Source 2FA Authenticator (2FAS) Alternatives

    The best open source alternative to 2FA Authenticator (2FAS) is Aegis Authenticator. If that doesn't suit you, our users have ranked more than 25 alternatives to 2FA Authenticator (2FAS) and 16 is open source so hopefully you can find a suitable replacement. Other interesting open source alternatives to 2FA Authenticator (2FAS) are andOTP (Free, Open Source), FreeOTP (Free, Open Source), Nitrokey (Free, Open Source) and FreeOTP+ (fork of FreeOTP) (Free, Open Source).

    This page was last updated Feb 5, 2022
    • FreeProprietary
    • Android
    • iPhone
    • Android Tablet
    • iPad
    2FAS Authenticator is a simple and free application for Two Factor Authentication (2FA Authentication) which generates...
    Learn more about 2FA Authenticator (2FAS)

    1. It implements Time-based One-time Passwords (TOTP) and HMAC-Based One-Time Passwords (HOTP). Simply scan the QR code and login with the generated 6-digit code.

    2. FreeOTP is a two-factor authentication application for systems utilizing one-time password protocols with support for Android (3.0 or later) and iOS (7 or later). Tokens can be added easily by scanning a QR-code or by manually entering in the token configuration.
      FreeOTP vs 2FA Authenticator (2FAS) opinions
      pros, cons and recent comments
      Needed a FOSS alternative to the Google Authenticator app to access my company's corporate G-suite instance. This is a simple app and works like a charm!
      Positive comment almost 2 years ago

    3. Nitrokey is an USB key to enable highly secure encryption and signing of emails and data, as well as login to the Web, networks and computers. Other than ordinary software solutions, the secret keys are always stored securely inside the Nitrokey.
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    4. FreeOTP+ is a fork of FreeOTP with an updated user interface and with backup/restore functionality (to external files or via built-in Android backup/restore).

      • Mac
      • Windows
      • Linux
      • Android
      Solo is an open source security key, and you can get one at
    5. Authenticator generates two-factor authentication (2FA) codes in your browser. Use it to add an extra layer of security to your online accounts.
    6. Authenticator is a simple, free, and open source two-factor authentication app. It helps keep your online accounts secure by generating unique one-time passwords, which you use in combination with your other passwords to log into supporting websites.
    7. Authenticator Pro generates Two Factor Authentication (2FA) codes for your online accounts. TOTP, HOTP, mOTP (Mobile-OTP) and Steam are supported. The generated codes are one time tokens that provide an extra layer of security to your online accounts.
    8. GTK+ application for securely managing TOTP & HOTP tokens. Content is encrypted on disk using AES256-GCM. Master password derived using PBKDF2 with 100k iterations & SHA512 as hash algorithm. Can import encrypted backups from andOTP & Authenticator+.
    Showing 10 of 16 alternatives