Stable versions

IronRuby maintains compatible versions with Ruby 1.8.6 and Ruby 1.9; IronRuby 1.0 and IronRuby 1.1.3, respectively. If you're not sure which version to use, use IronRuby 1.1.3, but only if you do not need Ruby 1.8.6 compatibility.

All major IronRuby releases

Latest version

The latest version of IronRuby is IronRuby 1.1.3, which is tracking compatibility with Ruby 1.9.2.


IronRuby is a cross-platform and cross-browser programming language, so prerequisites will vary based on usage.

Here are the recommended runtimes are for each platform:

Windows desktop & server apps

On Windows for desktop and server usage, the .NET framework is the recommended runtime.


IronRuby also runs on .NET: 3.5 SP1, but must be compiled from

Windows & Mac OS browser apps

On Windows & Mac OS for browser usage, Silverlight is the recommended runtime.

Silverlight enables you to use Ruby to script HTML pages just as you would with JavaScript, and also enables advanced vector graphics for rich user-interfaces and video.

Mac OS & Linux desktop & server apps

IronPython runs on Mono, a cross platform, open source .NET framework, enables IronPython to be used on Linux, Mac OS, and BSD systems.

Linux browser apps

IronPython also runs on Moonlight, a open source implementation of Microsoft Silverlight for Unix systems.


Moonlight 2 targets the Silverlight 2 API, so if you want to
run the same application on all platforms make sure to only use
Silverlight 2 APIs, or provide a fallback implementation for