Online Crystal Compiler
Write Crystal in the browser and run it on our machines. The editor is opening.
Free online Crystal IDE
JDoodle is an online IDE that has served the programming community since 2013. You write, compile, and run code in the browser for Crystal and many other languages, without installing a toolchain.
What you see on this page is JDoodle’s multi-file Crystal IDE. You can keep several files in one project, then execute on JDoodle’s servers. You do not need a JDoodle account to run code.
Online Crystal IDE
JDoodle’s Crystal editor on this page highlights syntax, completes as you type, matches brackets, and folds blocks. It is an online Crystal editor and a compiler together: you write here, then Execute runs your program on JDoodle’s servers.
Crystal versions on JDoodle
JDoodle currently ships these Crystal builds. Choose one from the version menu before you execute. The installed releases are 1.10.1, and 1.19.1.
| Version |
|---|
| 1.10.1 |
| 1.19.1 |
Frequently asked questions
Is JDoodle’s online Crystal IDE free?
Yes. JDoodle lets you write and run Crystal without paying. A JDoodle account is only needed to save projects, use more AI credits, or unlock faster workspaces.
Do I need to install Crystal to use JDoodle?
No. JDoodle runs Crystal on its servers. Open this page in a browser and execute.
Which Crystal version should I pick on JDoodle?
Choose the version that matches the course or codebase you are working against from the version menu. The builds JDoodle has installed are 1.10.1, and 1.19.1.
Is this the single-file Crystal compiler?
No. This page is JDoodle’s multi-file Crystal IDE, for classes, packages and libraries split across files. The single-file compiler, which runs one file and starts faster, is the online Crystal compiler.
Is this an online Crystal editor or a compiler?
Both. The page is an online Crystal editor and it compiles and runs what you write.
Input, interactive runs, files, and the rest of the editor work the same on every language. See the JDoodle IDE documentation.