NanoGUI is a minimalistic cross-platform widget library for OpenGL 3.x or higher. It supports automatic layout generation, stateful C++11 lambdas callbacks, a variety of useful widget types and Retina-capable rendering on Apple devices thanks to NanoVG by Mikko Mononen. Python bindings of all functionality are provided using pybind11.

Example Screenshot

Screenshot of Example 1.


NanoGUI builds on GLFW for cross-platform OpenGL context creation and event handling, GLAD to use OpenGL 3.x or higher Windows, Eigen for basic vector types, and NanoVG to draw 2D primitives.

Note that the dependency library NanoVG already includes some basic example code to draw good-looking static widgets; what NanoGUI does is to flesh it out into a complete GUI toolkit with event handling, layout generation, etc.

NanoGUI currently works on Mac OS X (Clang) Linux (GCC or Clang) and Windows (Visual Studio ≥ 2015); it requires a recent C++11 capable compiler. All dependencies are jointly built using a CMake-based build system.

“Simple mode”

Christian Schüller contributed a convenience class that makes it possible to create AntTweakBar-style variable manipulators using just a few lines of code. Refer to Example 2 for how to create the image below.

Screenshot of Example 2.


NanoGUI is provided under a BSD-style license that can be found in the LICENSE file. By using, distributing, or contributing to this project, you agree to the terms and conditions of this license.

NanoGUI uses Daniel Bruce’s Entypo+ font for the icons used on various widgets. This work is licensed under a CC BY-SA 4.0 license. Commercial entities using NanoGUI should consult the proper legal counsel for how to best adhere to the attribution clause of the license.


The CC BY-SA 4.0 license should not be an issue for most projects. However, you can adopt a different font for icons if you need. See Including Custom Fonts.

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