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description=Crystal is a general-purpose, object-oriented programming language. With syntax inspired by Ruby, it’s a compiled language with static type-checking. Types are resolved by an advanced type inference algorithm.;

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the crystal programming language blog install sponsors community docs github repository forum rss newsfeed crystal a language for humans and computers latest release 1 21 1 install get started try online examples intro rich stdlib types flow typing concurrency c bindings macros shards crystal is a general purpose object oriented programming language with syntax inspired by ruby it s a compiled language with static type checking types are resolved by an advanced type inference algorithm language specification a very basic http server require http server server http server new do context context response content_type text plain context response print hello world got context request path end address server bind_tcp 8080 puts listening on http address this call blocks until the process is terminated server listen batteries included crystal s standard library comes with a whole range of libraries that let you start working on your project right away check the api docs require http client require json response http client get https crystal lang org api versions json json json parse response body version json versions as_a find entry entry released false name puts latest crystal version version unknown type system the compiler catches type errors early avoids null pointer exceptions at runtime the code is still clean and feels like a dynamic language more about the type system def add a b a b end add 1 2 3 add foo bar foobar flow typing the compiler tracks the type of variables at each point and restricts types according to conditions loop do case message gets type is string nil when nil break when puts please enter a message else in this branch message cannot be nil so we can safely call string upcase puts message upcase end end concurrency model crystal uses green threads called fibers to achieve concurrency fibers communicate with each other via channels without having to turn to shared memory or locks csp read more about concurrency channel channel int32 new 3 times do i spawn do 3 times do j sleep rand 100 milliseconds add non determinism for fun channel send 10 i 1 j end end end 9 times do puts channel receive end c bindings bindings for c libraries makes it easy to use existing tools crystal calls lib functions natively without any runtime overhead no need to implement the entire program in crystal when there are already good libraries for some jobs learn how to bind to c libraries define the lib bindings and link info link m lib libm fun pow x libc double y libc double libc double end call a c function like a crystal method puts libm pow 2 0 4 0 16 0 macros crystal s answer to metaprogramming is a powerful macro system which ranges from basic templating and ast inspection to types inspection and running arbitrary external programs read more about macros macro upcase_getter name def name id name id upcase end end class person upcase_getter name def initialize name string end end person person new john person name john dependencies crystal libraries are packed with shards a distributed dependency manager without a centralised repository it reads dependencies defined in shard yml and fetches the source code from their repositories read more about shards name hello world version 1 0 0 license apache 2 0 authors crys crystal manas tech dependencies mysql github crystal lang crystal mysql version 0 16 0 news releasing execution contexts 12 jul 2026 julien portalier project multithreading two and a half years ago with the invaluable support from 84codes we re examined the multithreading model inherited from crystal 0 28 preview mt post mortem http request smuggling vulnerability 26 may 2026 julien portalier technical post mortem security http on 12 april 2026 we received a vulnerability report regarding an http request smuggling vulnerability in http server official linux arm64 builds 07 apr 2026 julien portalier project packaging finally starting with crystal 1 19 we provide official arm64 builds crystal talk at fosdem 2026 23 jan 2026 johannes müller community events talk community foss fosdem johannes is speaking about crystal at fosdem 2026 in brussels more news feed release notes sponsorship become a crystal sponsor in only 3 simple steps via opencollective contribute enterprise support sponsoring crystal creates a great springboard for your brand get support hire us for your project you can tap into the expertise of the very creators of the language to guide you in your implementation hire us top sponsors 84codes manas tech success stories section titled success stories 84codes lavinmq understanding code to get the best performance bright security crystal the lingua franca at bright placeos automating smart buildings with crystal more success stories used in production crystal compass found a typo or want to help improve this page edit on github or file an issue home blog install releases success stories sitemap documentation getting started tutorials api docs specification guides media community team sponsors events used in production governance help crystal forum crystal discord r crystal_programming irc crystal lang web logs matrix crystal lang_crystal gitter im web news feeds blog posts and releases releases newsletter subscribe to our newsletter submit github youtube mastodon twitter licensed under the apache license version 2 0 crystal language born raised at manas