This chat client works on both your desktop and phone and will let you communicate over the free and de-centralized and secure Matrix instant messaging platform.
There are two ways of getting features into KDE apps that work better than wishing 😉 :
contributing to our fundraiser, or donating to the project, or whatever. That is, providing the developers with means to get stuff done, either by buying them time so they can spend it on developing, or hiring help. If you are on this thread it is because you are doing this, or considering doing this, or whatever, so we can assume you already know about this.
contributing with your know-how. Check out our get involved page, as it describes in detail how you can help with the implementation the things NeoChat needs.
Libquotient just added cross-signing support, which works in Neochat if it's build against the new version. I'm not sure what else was missing from E2EE support.