Proton Mail
End-to-end encrypted email from Switzerland. Zero access to your messages — even Proton can't read them. Open-source, audited, used by journalists and activists worldwide. Messages between Proton accounts are encrypted end to end automatically, without either side configuring anything.

Proton Mail, as it opens in a browser tab.
Not sure how to add Proton Mail to your home screen? Step-by-step for Chrome, Safari, Firefox and Edge — it takes about ten seconds, and there is no app store involved.
Own Proton Mail? Have us re-run this measurement — we open it in a real browser, cut the network, and send you what survived.
How to install Proton Mail as a PWA
Screenshots
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