Dear ImGui is a C++ library for building graphical user interfaces using an immediate-mode GUI approach, designed to be lightweight with minimal dependencies and work across multiple platforms. Developers use it to quickly create debuggers, editors, profilers, and other tools, as well as in-game UI for game engines, without the overhead of traditional retained-mode GUI frameworks. It's particularly popular in game development and graphics applications where performance and simplicity matter.

1,229 open issues · last updated Jul 21, 2026