March 11, 2026 What if you could run a fully functional Rails application — backend, database, file storage, and all — directly inside a browser tab, with zero servers? WebAssembly (Wasm) makes this possible. By compiling Ruby and Rails into a Wasm module, the entire application stack executes client-side. This post explores a practical journey:…

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A technical walkthrough of running a full Ruby on Rails application entirely inside the browser using WebAssembly. The guide covers compiling Ruby 3.2+ to Wasm with the wasmify-rails gem, replacing Puma with a Service Worker, using SQLite compiled to Wasm for persistence, handling file storage via the Origin Private File System (OPFS), and packaging everything as a PWA. Performance trade-offs are discussed (70 MB bundle, ~300 MB memory per VM, slower CPU execution), along with real-world use cases like offline-first apps, educational playgrounds, and rapid prototyping.

Ruby on Rails on WebAssembly: A Full-Stack, In-Browser Journey