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This Open Toolkit library is a fast, low-level C# wrapper for OpenGL and OpenAL. It can be used standalone or inside a GUI on Windows, Linux, Mac, Android and iOS.
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The Open Toolkit is an advanced, low-level C# library that wraps OpenGL, OpenGL ES and OpenAL. It is suitable for games, scientific applications and any other project that requires 3d graphics, audio or compute functionality.

Project website:

Official git repository:


  • Create cutting-edge graphics with OpenGL 4.4 and OpenGL ES 3.0
  • Spice up your GUI with 3d graphics
  • Improve your code flow with strong types and inline documentation
  • Write once run everywhere!

OpenTK is available on Windows, Linux, Mac OS X, *BSD, SteamOS, Android and iOS. It can be used standalone or integrated into a GUI (Windows.Forms, WPF, GTK+, Qt, VTK, ...)

Binaries and NuGet packages available at


  • Merge opentk/opentk (upstream) with mono/opentk (Xamarin)
  • Add Portable Class Library (PCL) target
  • Add multitouch API
  • Add new platforms: NaCL, emscripten, Windows Metro, Ouya, Raspberry PI
  • Improve OpenCL bindings
  • Improve math library


  1. Install git and a C# IDE (see requirements section below)
  2. Fork the develop branch of
  3. Commit your changes in small, incremental steps with clear descriptions
  4. When ready, issue a Pull Request (PR) against the develop branch of

For details on coding style and best practices, refer to


  • Windows (XP/Vista/7/8), Linux, Mac OS X, *BSD, SteamOS, Android or iOS
  • For graphics, OpenGL drivers or a suitable emulator, such as ANGLE
  • For audio, OpenAL drivers or OpenAL Soft
  • To develop desktop applications: Visual Studio, Xamarin Studio, MonoDevelop or SharpDevelop
  • To develop Android applications: Xamarin Studio or the Xamarin Extensions for Visual Studio
  • To develop iOS applications: Xamarin Studio and XCode


Your favorite IDE will display inline documentation for all OpenTK APIs. Additional information can be found in the OpenTK Manual and in the opentk/Documentation/ folder.

Technical documentation about the implementation of OpenTK can be found in the Technical Wiki.

Need Help?

Post your questions at the OpenTK forums.

Report bugs at


The Open Toolkit is distributed under the permissive MIT/X11 license and is absolutely free.

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