Security assessment by Trail of Bits: https://simplex.chat/blog/20221108-simplex-chat-v4.2-security-audit-new-website.html

SimpleX Chat features:
– end-to-end encrypted messages, with editing, replies and deletion.
– disappearing messages with opt-out per contact/group.
– NEW message reactions.
– NEW delivery receipts, with opt-out per contact.
– multiple chat profiles, with hidden profiles.
– app access and self-destruct passcodes.
– incognito mode – unique to SimpleX Chat.
– sending end-to-end encrypted images and files.
– voice messages up to 5 minutes – also end-to-end encrypted.
– "live" messages – they update for all recipients as you type them, every few seconds – unique to SimpleX Chat.
– single-use and long-term user addresses.
– secret chat groups – only group members know it exists and who is the member.
– end-to-end encrypted audio and video calls.
– connection security code verification, for contacts and group members – to protect from man-in-the-middle attacks (e.g. invitation link substitution).
– private instant notifications.
– encrypted portable chat database – you can transfer your chat contacts and history to another device.
– animated images and "stickers" (e.g., from GIF and PNG files and from 3rd party keyboards).

SimpleX Chat advantages:
– privacy of your identity, profile, contacts and metadata: unlike any other existing messaging platform, SimpleX uses no phone numbers or any other identifiers assigned to the users – not even random numbers. This protects the privacy of who you are communicating with, hiding it from SimpleX platform servers and from any observers.
– complete protection against spam and abuse: as you have no identifier on SimpleX platform, you cannot be contacted unless you share a one-time invitation link or an optional temporary user address.
– full ownership, control and security of your data: SimpleX stores all user data on client devices, the messages are only held temporarily on SimpleX relay servers until they are received.
– decentralized proxied peer-to-peer network: you can use SimpleX Chat via your own relay servers and still communicate with people using pre-configured or any other SimpleX relay servers.
– fully open-source code.

You can connect to anybody you know via link or scan QR code (in the video call or in person) and start sending messages instantly – no emails, phone numbers or passwords needed.

Your profile and contacts are only stored in the app on your device – relay servers do not have access to this information.

All messages are end-to-end encrypted using open-source double-ratchet protocol; the messages are delivered via relay servers using open-source SimpleX Messaging Protocol.

Please send us any questions via the app (connect to the team via the app settings!), email chat@simplex.chat or submit issues on GitHub (https://github.com/simplex-chat/simplex-chat/issues)

Read more about SimpleX Chat at https://simplex.chat

Get source code in our GitHub repo: https://github.com/simplex-chat/simplex-chat

Follow us on Reddit (r/SimpleXChat/), Twitter (@SimpleXChat) and Mastodon (https://mastodon.social/@simplex) for the latest updates.

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