LispBM WebAssembly REPL Now Available in the Browser

We’re excited to highlight a new way to experiment with LispBM: a fully in-browser REPL powered by WebAssembly.

You can try it here: https://www.lispbm.com/repl-wasm/index.html

This REPL runs entirely in a sandboxed browser environment, allowing you to write and evaluate Lisp code instantly, without installing any tools or modifying your local setup. It’s a lightweight and accessible way to explore LispBM, whether you’re testing small snippets or learning the language fundamentals.

Because it’s built with WebAssembly, the REPL executes locally in your browser while remaining isolated from your system. This makes it a safe environment for experimentation, ideal for both newcomers and experienced users who want a quick testing ground.

The WebAssembly REPL is especially useful for:

  • Rapid prototyping of LispBM code

  • Learning and experimenting with language features

  • Sharing small, reproducible examples

  • Debugging logic in a minimal setup

This release lowers the barrier to entry for LispBM and provides a convenient tool for the community to explore its capabilities more freely.

We’d also like to thank Joel Svensson for his continuous development of the LispBM program and the tools that support it.

Give it a try and see what you can build.