Opal

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On the record

Browsers

For the upcoming 2.0 release, the project lists current and previous stable Firefox, Chrome, Safari, and Edge as supported and says Internet Explorer is unsupported.github.com · read 7 Oct 2026

Code sharing

The project describes using the same gem, objects, and specs on both the server and client.github.com · read 7 Oct 2026

Compilation

Opal compiles Ruby to plain JavaScript ahead of time, without a runtime interpreter.github.com · read 7 Oct 2026

Execution targets

The project says Opal can run in browsers and in JavaScript environments including Node.js, Deno, Bun, and QuickJS.github.com · read 7 Oct 2026

Framework integrations

The project lists integrations for Rails, Sinatra, Roda, and static apps.github.com · read 7 Oct 2026

JavaScript interop

Opal supports calling JavaScript from Ruby and Ruby from JavaScript, and treating native JavaScript classes as Ruby classes.github.com · read 7 Oct 2026

License

Opal is released under the MIT License.opalrb.com · read 7 Oct 2026

Maker details

The opened official pages identify Adam Beynon in the license copyright notice but do not state a headquarters or founding date.opalrb.com · read 7 Oct 2026

Rails usage

The official homepage shows using opal-rails in a Rails app and requiring opal_ujs and turbolinks in its example.opalrb.com · read 7 Oct 2026

Ruby compatibility

The repository says the gemspec declares Ruby >= 2.3 and CI exercises Ruby 3.0 through 4.0 and JRuby.github.com · read 7 Oct 2026

Ruby installation

The project instructs users to install Opal with `gem install opal` or add the gem to a Gemfile.github.com · read 7 Oct 2026

Runtime requirement

Opal 2.0 targets ES2021 and has no transpilation fallback for older JavaScript engines.github.com · read 7 Oct 2026

Support

The project directs users to Slack, Stack Overflow with the #opalrb tag, and GitHub issues for bugs and feature requests.github.com · read 7 Oct 2026

What it does

Opal is a Ruby-to-JavaScript source-to-source compiler that includes an implementation of Ruby corelib and stdlib.github.com · read 7 Oct 2026

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