Draft:Delta Chat

Delta Chat is a decentralized and encrypted messaging app, available for mobile and desktop platforms.

Delta Chat looks like WhatsApp, Telegram and other messaging apps but internally it is an encrypted e-mail client. Users can signup anonymously to a variety of interoperable chatmail servers which are minimal e-mail servers optimized for fast and secure operations. It is also possible to use classic e-mail servers and an existing e-mail account in which case Delta Chat acts as a normal e-mail app.

Delta Chat supports direct(one-on-one) chats as well as group chats. End-to-end encryption with contacts and group chats is automatically established via Autocrypt which in turn uses a subset of the OpenPGP standard.

Delta Chat also supports Webxdc (in-chat mini-apps) allowing users to play mini-games or use collaborative tools with their chat partners.

Reception
The popular German media conglomerate Heise published two articles about Delta Chat, the first in 2019 and the second in 2023

In 2019 the regional newspaper HNA published an article about Delta Chat.

As of 2024, the Delta Chat project underwent four independent security audits and one independent security analysis.