Crystal (programming language)

Crystal
Paradigm	Multi-paradigm: object-oriented, concurrent
Designed by	Ary Borenszweig, Juan Wajnerman, Brian Cardiff
Developer	Manas Technology Solutions
First appeared	June 19, 2014
Stable release	1.16.2 / 29 April 2025
Typing discipline	static, inferred, nominal, duck
Implementation language	Crystal
Platform	IA-32 (i386), x86-64, AArch64
OS	Linux, macOS, FreeBSD, OpenBSD, Windows
License	Apache License 2.0
Filename extensions	.cr
Website	crystal-lang.org
Influenced by
	Ruby, Go

Crystal is a high-level general-purpose, object-oriented programming language, designed and developed by Ary Borenszweig, Juan Wajnerman, Brian Cardiff and more than 400 contributors.^[5] With syntax inspired by the language Ruby,^[6] it is a compiled language with static type-checking, but specifying the types of variables or method arguments is generally unneeded. Types are resolved by an advanced global type inference algorithm.^[7]^[8] Crystal is currently in active development. It is released as free and open-source software under the Apache License version 2.0.

^ "Crystal 0.1.0 released!". crystal-lang. 19 June 2014.
^ "Release 1.16.2". 29 April 2025. Retrieved 10 May 2025.
^ ^a ^b Cite error: The named reference platform-support was invoked but never defined (see the help page).
^ Cite error: The named reference go multithread was invoked but never defined (see the help page).
^ Cite error: The named reference contributors was invoked but never defined (see the help page).
^ Cite error: The named reference rel_0.18.0 was invoked but never defined (see the help page).
^ Cite error: The named reference type-inference-i was invoked but never defined (see the help page).
^ Cite error: The named reference devm was invoked but never defined (see the help page).