Google Authenticator is described as 'Generates 2-Step Verification codes on your phone' and is a popular Authenticator in the security & privacy category. There are more than 50 alternatives to Google Authenticator for a variety of platforms, including iPhone, Android, iPad, Android Tablet and Mac apps. The best Google Authenticator alternative is Aegis Authenticator, which is both free and Open Source. Other great apps like Google Authenticator are KeePass, Ente Auth, Proton Authenticator and Bitwarden Authenticator.
A free open-source two factor authentication app for Android. It features encrypted backups, icons, categories and a high level of customisation. It also has a Wear OS companion app.
Authenticator generates two-factor authentication (2FA) codes in your browser. Use it to add an extra layer of security to your online accounts.
Easy, Open Source and available via Browser Addon. You can even scan the QR Code with a screenshot. BEST 2FA!!!
Free, open source, and a browser extension for multiple browsers so you can use it on any platform? Hell yes.
Also it's super simple. It just does what it says on the box, no extra crap you don't want.
Manage all your passwords across all devices. Open Source password manager compatible with kdbx/keepass. Available on Android, iOS, iPadOS, MacOS, Linux and Windows. It can also be used as a cross-platform supported two factor authentication app.
Sign in is easy, convenient, and secure when you use Microsoft Authenticator. Use your phone, not your password, to log into your Microsoft account. You simply have to enter your username, then approve the notification sent to your phone.
easier to use and back up is possible
OnlyKey is an open source alternative to YubiKey. OnlyKey natively supports: a hardware password manager, multiple two-factor methods (FIDO2, TOTP, and Yubico® OTP), passwordless SSH login, and OpenPGP.
Open-source authenticator app for iOS and macOS generates time-based one-time passwords, supports secure iCloud sync and encrypted backup, FaceID and TouchID unlocking, QR code scanning, custom icons, search, handoff for copying codes, and encrypted export.
Not harvesting my data, simple & open source
Open source, free, with no data collection. All I need.
LastPass Authenticator offers a unique one-tap password verification experience that no other authenticator app delivers.
If you're already using Lastpass Passwordmanager, then you get trouble-free sync here (as opposed to Authy and FreeOTP).
Alternative client for the Bitwarden® platform & KeePass (KDBX), created to provide the best user experience possible.
Tofu generates one-time passwords to help you protect your online accounts. These passwords are used together with your normal password when you sign into services like Google, Facebook, Dropbox, Amazon, and GitHub.
Gnome Authenticator is a desktop 2FA code generator for Linux desktops, like Ubuntu.
OVault is a super simple OTP app that lets you view and manage OTPs for all your accounts. Set up OTPs by scanning QR codes with your devices Camera App, or by manually providing the OTP secret to the app.
Protectimus Solutions provides a powerful multi-factor authentication service. We offer 2FA SaaS platform and on-premise version of the product which supports a great variety of TOTP tokens and program tokens for OTP delivery.
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It works on wear os and it is open-source.