Kaappi is an implementation of R7RS-small Scheme written in Zig. It provides a full language runtime, REPL, CLI tooling, and support for many SRFIs along with extensions for C and Zig interoperability. The project includes comprehensive documentation, a package manager (thottam), networking and web capabilities, and tools for building real applications such as REST APIs, HTTP clients, and concurrent programs. It is designed for users who want a modern, embeddable, and extensible Scheme environment.
In the Developer Tools space, Kaappi takes a focused approach. It focuses on implementing and running Scheme code in a modern, performant language with good interoperability to Zig and C. Kaappi is an open-source project aimed at programming language enthusiasts and developers. The project is open source (MIT). It runs on the command line, and it can be self-hosted.
kaappi builds and maintains Kaappi, and the product first shipped in 2026. The project is developed in the open on GitHub with 1.7k commits in the last 90 days. Among its 5 catalogued features are R7RS Scheme Compliance, REPL, and CLI Tooling.
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Vibecoded Scheme Implementation verified by the PulseGate indexer
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