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Snapshot 0 · 2026-11-04T12:47:22Z · Crystal · Apache-2.0
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e9e15c4756bfc0d82c703c69ffae1f9a3ce94cff94483a557440633e974340a6GitHub description at capture
The Crystal Programming Language
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# Crystal [](https://github.com/crystal-lang/crystal/actions?query=workflow%3A%22Linux+CI%22+event%3Apush+branch%3Amaster) [](https://github.com/crystal-lang/crystal/actions?query=workflow%3A%22macOS+CI%22+event%3Apush+branch%3Amaster) [](https://github.com/crystal-lang/crystal/actions?query=workflow%3A%22AArch64+CI%22+event%3Apush+branch%3Amaster) [](https://github.com/crystal-lang/crystal/actions?query=workflow%3A%22Windows+CI%22+event%3Apush+branch%3Amaster) [](https://circleci.com/gh/crystal-lang/crystal) [](https://gitter.im/crystal-lang/crystal) [](https://www.codetriage.com/crystal-lang/crystal) --- [](https://manas.tech/) Crystal is a programming language with the following goals: - Have a syntax similar to Ruby (but compatibility with it is not a goal) - Statically type-checked but without having to specify the type of variables or method arguments. - Be able to call C code by writing bindings to it in Crystal. - Have compile-time evaluation and generation of code, to avoid boilerplate code. - Compile to efficient native code. ## Why? We love Ruby's efficiency for writing code. We love C's efficiency for running code. We want the best of both worlds. We want the compiler to understand what we mean without having to specify types everywhere. We want full OOP. Oh, and we don't want to write C code to make the code run faster. ## Project Status Within a major version, language features won't be removed or changed in any way that could prevent a Crystal program written with that version from compiling and working. The built-in standard library might be enriched, but it will always be done with backwards compatibility in mind. Development of the Crystal language is possible thanks to the community's effort and the continued support of [84codes](https://www.84codes.com/) and every other [sponsor](https://crystal-lang.org/sponsors). ## Installing [Follow these installation instructions](https://crystal-lang.org/install) ## Try it online [play.crystal-lang.org](https://play.crystal-lang.org/) ## Documentation - [Language Reference](http://crystal-lang.org/reference) - [Standard library API](https://crystal-lang.org/api) - [Roadmap](https://github.com/crystal-lang/crystal/wiki/Roadmap) ## Community Have any questions or suggestions? Ask on the [Crystal Forum](https://forum.crystal-lang.org), on our [Gitter channel](https://gitter.im/crystal-lang/crystal) or IRC channel [#crystal-lang](https://web.libera.chat/#crystal-lang) at irc.libera.chat, or on Stack Overflow under the [crystal-lang](http://stackoverflow.com/questions/tagged/crystal-lang) tag. There is also an archived [Google Group](https://groups.google.com/forum/?fromgroups#!forum/crystal-lang). ## Contributing The Crystal repository is hosted at [crystal-lang/crystal](https://github.com/crystal-lang/crystal) on GitHub. Read the general [Contributing guide](https://github.com/crystal-lang/crystal/blob/master/CONTRIBUTING.md), and then: 1. Fork it (<https://github.com/crystal-lang/crystal/fork>) 2. Create your feature branch (`git checkout -b my-new-feature`) 3. Commit your changes (`git commit -am 'Add some feature'`) 4. Push to the branch (`git push origin my-new-feature`) 5. Create a new Pull Request