Original author(s)Stefanos Apostolopoulos
Stable release
4.8.1 / September 27, 2023; 5 months ago (2023-09-27)
Written inC#
TypeSoftware library
LicenseMIT License

OpenTK, also known as The Open Toolkit library, is a C# graphics library superseding the Tao Framework.[1] It provides access to graphics tools contained in OpenGL, OpenCL, and OpenAL to a variety of CLR-based languages (C#, F#, etc.).[2] Particularly, it is usable with any language utilizing either of the .NET Framework or Mono frameworks[3] for versions prior to 4.0 and .NET Core 3.1 and up, continuing with .NET 5, for major version 4.


  1. ^ "Tao Framework". Retrieved 2015-02-16.
  2. ^ "OpenTK Sourceforge page". Retrieved 2015-02-16.
  3. ^ "OpenTK project page". Archived from the original on 2017-10-05. Retrieved 2017-10-24.