SimpleX – private and encrypted messenger

SimpleX is a messaging platform that has no user identifiers of any kind – 100% private by design.

You can create contacts and groups, and have two-way conversations, as in any other messenger. For each connection you use two separate messaging queues to send and receive messages via different servers. Servers only pass messages one way, without having the full picture of user’s conversation or connections. The servers have separate Anonymous credentials for each queue, and do not know which users they belong to. Users can further improve metadata privacy by using Tor to access servers, preventing correlation by IP address

Privacy is ensured by using temporary anonymous pairwise identifiers, out-of band key exchange, 2 layers of end-to-end encryption, message integrity verification, and an additional layer of server encryption. Other factors which improve security include message mixing to reduce correlation, secure authenticated TLS transport, optional access via Tor, unidirectional message queues, and multiple layers of content padding.

This is free and open source software.

Features include:

• E2E-encrypted messages with markdown and editing.
• E2E-encrypted images, videos and files.
• E2E-encrypted decentralized groups — only users know they exist.
• E2E-encrypted voice messages.
• Disappearing messages.
• E2E-encrypted audio and video calls.
• Portable encrypted app storage — move profile to another device.
• Incognito mode — unique to SimpleX Chat.
• Cross-platform support – runs under Linux, Android, macOS, and Windows, There are packages for Debian/Ubuntu as well as cross-distro Flatpak and AppImage.

Website: simplex.chat
Support: GitHub Code Repository
Developer: SimpleX
License: GNU Affero General Public License v3.0

SimpleX is written in Haskell, Kotlin and Swift. Learn Haskell with our recommended free books and free tutorials. Learn Kotlin with our recommended free books and free tutorials. Learn Swift with our recommended free books and free tutorials.

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