Libkeychat is written in Rust, but developers are free to build clients in any programming language they prefer. The choice mainly depends on the type of application they want to create — whether it’s a web app, desktop app, CLI app, TUI app, iOS app, or Android app. In addition, libkeychat exposes the five layers of communication, allowing developers to design applications for different use cases on top of this foundation. Since communication is the core infrastructure, it serves as a solid base for building a wide range of applications.