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ocornut/imgui

🔥 Hot★ 73,284C++Audience · developerComplexity · 2/5ActiveLicenseSetup · moderate

TLDR

A lightweight C++ library for building graphical interfaces that redraw each frame, designed for game development tools and debugging panels.

Mindmap

mindmap
  root((repo))
    What it does
      Immediate mode GUI
      Redraws each frame
      Minimal dependencies
    Use cases
      Game debugging
      Property editors
      In-app tools
    Tech stack
      C++ library
      Game engines
    Design philosophy
      Lightweight
      Drop-in ready
      Avoids bulk

Things people build with this

USE CASE 1

Add debugging panels and property editors to game engines without heavy UI framework overhead.

USE CASE 2

Build in-game tools and editor windows for real-time parameter tweaking during development.

USE CASE 3

Create lightweight UI overlays for performance monitoring and diagnostics in C++ applications.

Tech stack

C++OpenGLDirectXVulkan

Getting it running

Difficulty · moderate Time to first run · 30min

Requires choosing and installing one of three graphics backends (OpenGL/DirectX/Vulkan) plus C++ compiler setup.

Use freely for any purpose, including commercial use, as long as you keep the copyright notice and license text.

In plain English

Dear ImGui is a C++ library for building graphical user interfaces with minimal setup overhead. The name stands for "Immediate Mode GUI," a style where the interface is redrawn from scratch every frame rather than being built from a persistent tree of objects, which simplifies the code needed to display and update UI elements. It is designed for game development and game engine tooling, where developers often need debugging panels, property editors, or in-app tools without the weight of a full UI framework. The description highlights that it has minimal dependencies and avoids unnecessary bulk, making it straightforward to drop into an existing C++ project. The README does not provide further detail about its features, architecture, supported platforms, or use cases, so a complete explanation is not possible from the provided data alone.

Copy-paste prompts

Prompt 1
Show me how to set up Dear ImGui in my C++ game engine project and render a simple debug window.
Prompt 2
How do I create a property editor panel with sliders and text inputs using Dear ImGui?
Prompt 3
What's the best way to integrate Dear ImGui into an existing OpenGL or DirectX renderer?
Prompt 4
Give me example code for a real-time performance monitor UI using Dear ImGui.
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Generated 2026-05-18 · Model: sonnet-4-6 · Verify against the repo before relying on details.