Opal (Ruby)

Source-to-source compiler from Ruby to JavaScript, packed with Ruby's core library.

Adoption1 site

Ranked 13 of 13 in Compiled-to-Web & WebAssembly0.7% of the 151 tracked sites using Compiled-to-Web & WebAssembly

Pricing: open-source

About Opal (Ruby)

Ruby developers can run their code in the browser through Opal, which compiles it ahead of time to plain JavaScript with no VM to download. Every string is immutable, so Ruby's mutating string methods don't exist. Tutorials cover Rack and Rails.

Sources: Opal, raw.githubusercontent.com README.md, raw.githubusercontent.com unsupported_features.md · Checked 16 Oct 2026

Websites using Opal (Ruby)

nudebarre.com

Who added or dropped it

No switches yet. We rescan every site monthly, and any site that adds or drops Opal (Ruby) shows up here.

Often used with

Awin100%
Bootstrap100%

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