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Grant
Theme fund: NGI0 Commons Fund
Start: 2025-04
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Services + Applications

Kaidan MUC + legacy OMEMO

Multi-user chat and improved legacy interoperability for Kaidan XMPP client

Kaidan is a user-friendly and modern chat app for every device. It uses the open communication protocol XMPP (Jabber). Unlike other chat apps, you are not dependent on one specific service provider. Instead, you can choose between various servers and clients. Kaidan is one of those XMPP clients.

It is easy to get started and switch devices with Kaidan. Additionally, it adapts to your operating system and device's dimensions. It runs on mobile and desktop systems including Linux, Windows, macOS, Android, Plasma Mobile and Ubuntu Touch. The user interface makes use of Kirigami and Qt Quick. The backend of Kaidan is entirely written in C++ using Qt and the Qt-based XMPP library QXmpp.

This project will make improvements to Kaidan across the board, ranging from multi-user chat, backups, bookmarks, support for legacy OMEMO encryption, SASL improvements, message retraction and more media sharing functionality.

Logo NLnet: abstract logo of four people seen from above Logo NGI Zero: letterlogo shaped like a tag

This project was funded through the NGI0 Commons Fund, a fund established by NLnet with financial support from the European Commission's Next Generation Internet programme, under the aegis of DG Communications Networks, Content and Technology under grant agreement No 101135429. Additional funding is made available by the Swiss State Secretariat for Education, Research and Innovation (SERI).