An intermediate report for Ruby Association Grant on TutorialKit.rb, a toolkit for building interactive Ruby and Rails tutorials that run entirely in the browser using WebAssembly and WebContainers.

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Martian Chronicles

Evil Martians introduces TutorialKit.rb, a framework for building interactive Ruby and Rails tutorials that run entirely in the browser using WebAssembly. The project extends TutorialKit (originally for JavaScript) to support Ruby, enabling zero-install learning experiences. Key technical achievements include virtual filesystem enhancements, Wasm module caching, and custom gem bundling pipelines. The team explored multiple gem distribution strategies (build-time embedding, tarball distribution, runtime bundle support) and is working on HTTP support for Wasm-constrained environments. An Action Policy tutorial serves as the first real-world example, with ongoing work to finalize HTTP requests, complete tarball distribution evaluation, and polish the developer experience.

Tutorialkit.rb: the ruby.wasm journey goes onward—Martian Chronicles, Evil Martians’ team blog

The future of Rails begins in the browser