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Mobile app · Security & privacy

Proton Authenticator

Private, secure, offline 2FA across devices by Proton team.

  • Free, with trade-offs
  • Windows, macOS, Linux, Android and iOS
  • Open source
  • No account

Overview

Proton Authenticator is a two-factor authentication mobile app, available on Windows, macOS, Linux, Android and iOS.

Features described in its F-Droid listing and on its official website: end-to-end encryption, offline use and sync across devices.

Overview written by LicitPro from the documentation published by the authors and the cited sources; we have not tried the resource ourselves.

Excerpts that establish this information
  • “Protect your accounts with Proton Authenticator, an end-to-end encrypted, open source, and ad-free two-factor authentication (2FA) app available across devices.” — official website, 10 November 2026
  • “Protect your accounts with Proton Authenticator, an end-to-end encrypted, open source, and ad-free two-factor authentication (2FA) app available across devices.” — official website, 10 November 2026
  • “Protect your accounts with Proton Authenticator, an end-to-end encrypted, open source, and ad-free two-factor authentication (2FA) app available across devices.” — official website, 10 November 2026
  • “Protect your accounts with Proton Authenticator, a private and secure cross-device two-factor authentication (2FA) that works offline.” — F-Droid, 10 November 2026
  • “Sync your 2FA codes to all your devices with end-to-end encryption.” — F-Droid, 10 November 2026

At a glance

Proton Authenticator is free, with trade-offs: it relies on a non-free online service and it sends tracking data.

Its licence (GPL-3.0+) is a copyleft open source licence: you may use, study, modify and redistribute it, including commercially; modified versions must keep the same licence.

Strengths

  • Open source code
  • No account needed
  • No advertising
  • Commercial use allowed

Weaknesses

  • Flagged by F-Droid: relies on a non-free online service
  • Flagged by F-Droid: tracks user activity

Sources and checks

  • Facts collected from Unspecified source (platforms) —
  • Facts collected from Winget (Windows Package Manager) (credit card, account, publisher, licence, free status, platforms, commercial use, version) —
  • Facts collected from F-Droid (credit card, source code, publisher, licence, free status, platforms, ads, commercial use, version) —
  • Last technical check: 7 November 2026
  • Description from F-Droid — F-Droid (citation courte)

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