# Proton Authenticator vs Yubico Authenticator

Source: https://listme.name/compare/proton-authenticator-vs-yubico-authenticator
Framed by the ranking: https://listme.name/best/authenticator-apps

| | Proton Authenticator | Yubico Authenticator |
|---|---|---|
| Score | 89.0 | 88.0 |
| Rank | #2 | #3 |
| Price | Free | Free and open source |
| Best for | Encrypted sync across phones, tablets and desktops | Hardware-key users who want desktop and mobile access |
| Backups and sync | End-to-end encrypted sync and backup | Codes live on the YubiKey; no cloud backup described |

Open-source app with end-to-end encrypted sync and backup across phones, tablets and desktops, plus an Apple Watch app. No browser extension is listed, and the company is Swiss-based. Open-source companion app for YubiKey keys, with desktop builds for Windows, macOS and Linux and an Android app. It is useful only with a YubiKey, unlike the phone apps above, and its iOS version is a separate app.