February 22, 2026 A fully client-side Ruby playground powered by WebAssembly — promising, experimental, and not quite ready for prime time Running Ruby directly inside the browser has long been a dream for educators, tooling developers, and the Ruby core community. Thanks to WebAssembly (WASM), that vision is no longer theoretical. Rubox, a browser-based Ruby…

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Rubox is a browser-based Ruby playground that runs real Ruby code entirely client-side using WebAssembly and integrates TypeProf for static analysis without any server or installation. It supports shareable code via URL-embedded compressed snippets and uses Web Workers and Fibers to prevent UI freezing. Current limitations include large load sizes, slower execution than native Ruby, limited I/O handling, and restricted concurrency, making it a technology demonstration rather than a production tool. The project hints at a future where Ruby can be distributed and taught without infrastructure, enabling interactive documentation, offline tools, and serverless Ruby applications.

🧪 Ruby in the Browser? Exploring Rubox and the Future of Ruby WASM

A fully client-side Ruby playground powered by WebAssembly — promising, experimental, and not quite ready for prime time

TypeProf in the Browser: Static Analysis Without Installation

Debugging Without puts: The “Measure Value” Feature

Under the Hood: Fibers, Workers, and a Single Thread

The Bigger Picture: Ruby Without Infrastructure