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Proton Mail for iOS is the official iPhone and iPad client that brings Proton’s secure, end-to-end encrypted email service to Apple’s mobile ecosystem, combining strong privacy protections with native performance and gestures. The app allows users to sign in to one or multiple Proton Mail accounts, read and compose encrypted messages, schedule emails, protect emails with passwords, set expiration timers, and organize mail with labels and folders inside a smooth, intuitive iOS interface. It...

...It handles network communication and authentication with the backend, push notifications, local caching of data, client-side business logic, signaling with the audio-video libraries, encryption and decryption (using encryption libraries from a lower level) and other bits and pieces. The user interface layer of the mobile app is built on top of the sync engine, which provides the data to display to the UI. The sync engine itself is built on top of a few third-party frameworks, and uses Wire components that are shared between platforms for cryptography (Proteus/Cryptobox) and audio-video signaling (AVS).