Credit: Tushar Mehta / Android AuthorityProton Authenticator is a new free, open-source 2FA app for mobile and desktop.It supports encrypted multi-device sync, local-only storage, and easy import/export of 2FA tokens.The app works with or without a Proton account and avoids things like ads and trackers.Authenticator apps are a great way to help keep your accounts secure, but some of them come with annoying trade-offs. That could be ads, missing features, or making it hard to switch to another platform. Proton is trying to clean all that up with its own new 2FA app, called Proton Authenticator.The app just launched on Android, iOS, Windows, macOS, and Linux, and it brings most of the stuff you’d expect, like time-based 2FA codes, offline support, and the ability to protect your tokens with a PIN or biometrics. But there’s also a bit more going on in the background.