imgui VS FLTK

Compare imgui vs FLTK and see what are their differences.


Dear ImGui: Bloat-free Graphical User interface for C++ with minimal dependencies (by ocornut)


FLTK - Fast Light Tool Kit - - cross platform GUI development (by fltk)
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imgui FLTK
352 18
56,455 1,531
- 3.7%
9.7 9.8
2 days ago 5 days ago
C++ C++
MIT License GNU General Public License v3.0 or later
The number of mentions indicates the total number of mentions that we've tracked plus the number of user suggested alternatives.
Stars - the number of stars that a project has on GitHub. Growth - month over month growth in stars.
Activity is a relative number indicating how actively a project is being developed. Recent commits have higher weight than older ones.
For example, an activity of 9.0 indicates that a project is amongst the top 10% of the most actively developed projects that we are tracking.


Posts with mentions or reviews of imgui. We have used some of these posts to build our list of alternatives and similar projects. The last one was on 2024-04-06.
  • Dear ImGui version v1.90.6 released
    1 project | | 8 May 2024
  • Using raylib with Dear ImGui: Game Dev Debugging UI
    5 projects | | 6 Apr 2024
    include(cmake/CPM.cmake) function(raylib_imgui_setup_dependencies) message(STATUS "Include Dear ImGui") FetchContent_Declare( ImGui GIT_REPOSITORY GIT_TAG 277ae93c41314ba5f4c7444f37c4319cdf07e8cf) # v1.90.4 FetchContent_MakeAvailable(ImGui) FetchContent_GetProperties(ImGui SOURCE_DIR IMGUI_DIR) add_library( imgui STATIC ${imgui_SOURCE_DIR}/imgui.cpp ${imgui_SOURCE_DIR}/imgui_draw.cpp ${imgui_SOURCE_DIR}/imgui_widgets.cpp ${imgui_SOURCE_DIR}/imgui_tables.cpp) target_include_directories(imgui INTERFACE ${imgui_SOURCE_DIR}) include(cmake/CPM.cmake) message(STATUS "Include dbg-macro") cpmaddpackage( "gh:sharkdp/dbg-macro#fb9976f410f8b29105818b20278cd0be0e853fe8" )# v0.5.1 message(STATUS "Include fmtlib") cpmaddpackage("gh:fmtlib/fmt#e69e5f977d458f2650bb346dadf2ad30c5320281" )# 10.x message(STATUS "Include raylib") cpmaddpackage("gh:raysan5/raylib#ae50bfa2cc569c0f8d5bc4315d39db64005b1b0" )# v5.0 message(STATUS "Include spdlog") cpmaddpackage("gh:gabime/spdlog#7c02e204c92545f869e2f04edaab1f19fe8b19fd" )# v1.13.0 message(STATUS "Include rlImGui") FetchContent_Declare( rlImGui GIT_REPOSITORY GIT_TAG d765c1ef3d37cf939f88aaa272a59a2713d654c9) FetchContent_MakeAvailable(rlImGui) FetchContent_GetProperties(rlImGui SOURCE_DIR RLIMGUI_DIR) add_library(rlimgui STATIC ${rlimgui_SOURCE_DIR}/rlImgui.cpp) target_link_libraries(rlimgui PRIVATE imgui raylib) target_include_directories(rlimgui INTERFACE ${rlimgui_SOURCE_DIR}) endfunction()
  • Ask HN: Fastest cross-platform GUI stack/strategy
    3 projects | | 18 Mar 2024
  • Immediate Mode GUI Programming
    15 projects | | 15 Jan 2024
    Immediate mode is a fuzzy concept, as witnessed by this writeup:
  • Nebula is an open-source and free-to-use modern C++ game engine
    6 projects | | 9 Jan 2024
  • Black Triangles
    1 project | | 26 Dec 2023
    It's fun to see the evolution in e.g. these examples of image loading for Dear Imgui:

    DirectX9 will even load the image for you, DirectX11 okay we get a few more structures to fill out, DirectX12 is where it goes off the rails and we are filling out a bunch of UNKNOWN DONT_CARE JUST_DO_IT. Then of course Vulkan is the one that gets the big fat "this probably won't actually work for you" warning.

    I understand whats happening, but you know sometimes I just want to display a fucking image.

  • Dear ImGui: Bloat-free Graphical User interface with minimal dependencies
    10 projects | | 20 Dec 2023
    ImGui is engine/GPU agnostic

    Themeing isn't a just a retained mode thing, you can do wonders with immediate UIs, even thought (dear)ImGui doesn't provide much, you can still do wonders:

    More on that topic:

  • Where do I start to learn C++ for a game development
    2 projects | /r/gamedev | 10 Dec 2023
    Bonus: If you want to make desktop app with UI, then this is another great C++ library and it's also simple to learn as well.
  • GUI library for fast prototyping
    3 projects | /r/rust | 6 Dec 2023
    AFAIK the Rust equivalent to C++'s Dear ImGui is egui.
  • Stretching myself thin with Dear ImGui projects
    2 projects | | 28 Nov 2023
    They use a Dear ImGui, a C++ GUI library.


Posts with mentions or reviews of FLTK. We have used some of these posts to build our list of alternatives and similar projects. The last one was on 2023-05-15.

What are some alternatives?

When comparing imgui and FLTK you can also consider the following projects:

wxWidgets - Cross-Platform C++ GUI Library

nuklear - A single-header ANSI C immediate mode cross-platform GUI library

GTK+ - Read-only mirror of

NanoGUI - Minimalistic GUI library for OpenGL

nana - a modern C++ GUI library

fox-toolkit - Unofficial Zenotech specific mirror of fox-toolkit; please refer to upstream site for latest version

egui - egui: an easy-to-use immediate mode GUI in Rust that runs on both web and native

webview - Tiny cross-platform webview library for C/C++. Uses WebKit (GTK/Cocoa) and Edge WebView2 (Windows).


gtkmm - Read-only mirror of