Sometimes it can be a little annoying to check the mobile app to access a regular website. Is it possible to use an OTP authenticator app that can be used on both mobile and PC?
2 Answers
Update
Authy desktop reached EOL in March 2024. So it's no longer a viable option.
Out of other available apps with TOTP support, KeePassXC is a good cross-platform and open source alternative. It allows you to assign OTP to each entry, by right clicking on it and choosing TOTP -> Set up TOTP.... Detailed guide.
The disadvantage compared to Authy is that it's a local app rather than a web service, so you'll need to use external tools to sync the added entries using external tools. See e.g. question Share same KeepassXC on multiple devices for more info.
As for more similar alternatives that work more like cross-device services, there are few paid ones, I couldn't find anything free.
Initial answer
Google Authenticator has no PC version(s).
Authy is an example of an app which works on all commonly used systems. It can synchronize all accounts with password encrypted backups.
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Yes, Google Authenticator uses the standard OATH TOTP protocol. As long as you still have the original key or Qr code (issued by the website) from when the app was set up, you can import that PSK into any OATH TOTP-compatible desktop app. Several exist for Windows.
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