Proton Authenticator works on desktop and mobile, syncs securely, and gives you full control with no creepy data collection required

Proton Authenticator is a new 2FA app with encrypted sync, offline support, and no lock-in — all completely free and open source.

Proton launches a free, open-source 2FA app with cross-device sync. It works on all major OSes, including Ubuntu, as a privacy-focused alternative to Google Authenticator.