Duo mobile might be a bit more popular than Open Authenticator. We know about 1 link to it since March 2021 and only 1 link to Open Authenticator. We are tracking product recommendations and mentions on various public social media platforms and blogs. They can help you identify which product is more popular and what people think of it.
Except Google will abandon it just like they abandoned https://code.google.com/archive/. Source: about 1 year ago
Call me lazy but..for phone 2FA auth I'm using Duo in personal mode (TOTP). See guide.duo.com for a start. It's convenient and fast. My Yubikey is used for PC web 2FA and, no, I don't do any financials on mobile devices. Reason I picked Duo is Google Auth on Android had dings for not being secure (some say). BEWARE of Duo, if you try to buy they only sell in packs of 30 so that first bill could be... Source: almost 3 years ago
Authenticator - Authenticator is a simple, free, and open source two-factor authentication app.
andOTP - andOTP is a two-factor authentication App for Android 4.4+
Aegis Authenticator - Aegis Authenticator is a free, secure and open source app to manage your 2-step verification tokens...
OTP Auth - The app for calculating one-time-passwords on iPhone and iPad.
Google Authenticator - Google Authenticator is a multifactor app for mobile devices.
Tofu Authenticator - Tofu Authenticator is an open-source easy to use two-factor authentication app that lets you secure your accounts with one-time passwords.