SimpleX Chat

SimpleX Chat is an encrypted, open-source messaging platform prioritizing user privacy. It uses no traditional identifiers for maximum privacy, confirmed by a security assessment by Trail of Bits in November 2022.

Features include end-to-end encryption for messages, images, and files, with message editing, replying, and deleting options. It supports encrypted audio and video calls, secret chat groups, and private notifications. Users can transfer their chat history and contacts to other devices with a portable chat profile.

The platform doesn't use identifiers, ensuring privacy of identity, profile, contacts, and metadata. It provides protection against spam and abuse, and users can only be contacted through a one-time invitation link or a temporary user address. All data is stored on client devices, with messages temporarily held on SimpleX relay servers. The platform operates on a decentralized network, enabling users to use their own servers.

Users can connect via link or QR code and start messaging without needing emails, phone numbers, or passwords. User profiles and contacts are stored in the app on the user's device, inaccessible to servers. Messages are end-to-end encrypted using the open-source double-ratchet protocol and routed via servers using the SimpleX Messaging Protocol.