Signal

Signal is a messaging app for private conversations, with end-to-end encrypted messages, voice and video calls, and group chats. It runs on Android, iOS and desktop, and is developed by the non-profit Signal Foundation.

Signal's privacy protections are always on: every message and call is end-to-end encrypted, and the app is designed to collect as little data as possible. It supports HD voice and video calls, groups and media sharing. The Android, iOS and desktop apps and the server are all open source under the AGPL.

Signal is the standard for private messaging, trusted by security researchers and used by millions of people every day. All of its code is public, and its encryption protocol is used by other messaging apps too.

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signalapp/Signal-iOS

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