Delta Chat

Delta Chat is an open-source instant messenger for Android in the Communication category. It is designed for conversations among friends, family members, groups, and organizations. Its decentralized design supports messaging without relying on a single centralized service.

Users can begin using it without providing a phone number or other private data. People can choose to communicate only with contacts they know, while unknown users cannot message or follow them without mutual consent. The app supports multiple chat profiles and can be set up across multiple devices. Chats can also be extended with tools such as shopping lists, calendars, or gaming apps.

Delta Chat is intended to remain usable under poor or adversarial network conditions. It provides audited end-to-end encryption designed to protect conversations against network and server attacks. Users can run it with their own email address or server, giving the service a more sovereign operating model. The software is fully open-source and built on Internet Standards.

For Android users, MirrorNest distributes the official build directly from its own storage. The mirrored build is scanned for malware before it is published. This distribution setup provides an additional catalog source while keeping the package tied to the official Android build. Its open-source license and Communication classification make it suitable for users seeking a messaging application with flexible identity, deployment, and chat options.