Protonmail Desktop App -

: It provides a unified window with instant switching between Proton Mail and Proton Calendar .

She gasped. There, in a local encrypted cache, were the last 2,000 emails. Not as plain text—never that—but as shimmering ghosts she could decrypt with a single click of her private key stored securely in the OS keychain. She typed a frantic message to her editor:

Until the night of the blackout.

Normally, the browser would show a sad dinosaur or a spinning circle of death. But the desktop app whispered: Offline mode engaged.

: Advanced account protection for high-risk users. protonmail desktop app

He clicked a slide. It showed the architecture: local SQLite encryption, hardware security module integration, a sandboxed rendering engine that couldn't touch the network stack without asking for a key every thirty seconds.

For the first time, her laptop felt like a vault, not a kite. : It provides a unified window with instant

: Unlike the web version, the desktop app offers limited offline support, allowing you to view already-loaded emails and calendar events even when disconnected.

The magic happened when the Wi-Fi died completely. Not as plain text—never that—but as shimmering ghosts

This method uses your browser's technology to install the website as an app. You get an icon on your desktop/taskbar, a separate window, and desktop notifications.