diff --git a/core/CMakeLists.txt b/core/CMakeLists.txt
index 3695f47..470786b 100644
--- a/core/CMakeLists.txt
+++ b/core/CMakeLists.txt
@@ -86,7 +86,7 @@ set(ENGINE_SRC
     terrain.c ui.c scene.c font.c sound.c networking.c pngloader.c
     physics.c ui-animations.c input-fuzzer.c character.c settings.c
     gltf.c input-joystick.c render-gl.c mesh.c pipeline.c input-keyboard.c
-    game.c camera.c xyarray.c ca2d.c ca3d.c
+    game.c camera.c xyarray.c ca2d.c ca3d.c ui-imgui.c
     ${PLATFORM_SRC})
 
 # Mac OS X has deprecated OpenAL and is very vocal about it
diff --git a/core/clap.c b/core/clap.c
index e94c0b4..b5476d6 100644
--- a/core/clap.c
+++ b/core/clap.c
@@ -14,6 +14,7 @@
 #include "librarian.h"
 #include "physics.h"
 #include "settings.h"
+#include "ui-debug.h"
 #include "util.h"
 
 #ifdef HAVE_ASAN
diff --git a/core/display-glfw.c b/core/display-glfw.c
index 9984d52..95dbc10 100644
--- a/core/display-glfw.c
+++ b/core/display-glfw.c
@@ -7,6 +7,7 @@
 //#include <GL/glew.h>
 #include "display.h"
 #include <GLFW/glfw3.h>
+#include "ui-debug.h"
 #include "common.h"
 #include "input.h"
 #include "input-joystick.h"
@@ -174,6 +175,8 @@ void gl_init(const char *title, int w, int h, display_update update, void *updat
         ext = glGetStringi(GL_EXTENSIONS, i);
         msg("GL extension: '%s'\n", ext);
     }
+
+    imgui_init(window, width, height);
     // msg("GL initialized extensions: %s\n", exts);
 }
 
@@ -191,6 +194,7 @@ void gl_main_loop(void)
 
 void gl_done(void)
 {
+    imgui_done();
     glfwDestroyWindow(window);
     glfwTerminate();
 }
diff --git a/core/display-www.c b/core/display-www.c
index 663cfce..d3725b0 100644
--- a/core/display-www.c
+++ b/core/display-www.c
@@ -7,6 +7,7 @@
 #include "common.h"
 #include "display.h"
 #include "input-joystick.h"
+#include "ui-debug.h"
 
 static int width, height;
 
@@ -155,6 +156,7 @@ void gl_init(const char *title, int width, int height, display_update update_fn,
     msg("GL context: %d Extensions: '%s'\n", context, exts);
     EM_ASM(runtime_ready = true;);
     gl_get_sizes(NULL, NULL);
+    imgui_init(NULL, width, height);
     calc_refresh_rate(update_fn, data);
     //resize_fn(width, height);
 }
diff --git a/core/ui-debug.h b/core/ui-debug.h
index b5bfb76..1182ebe 100644
--- a/core/ui-debug.h
+++ b/core/ui-debug.h
@@ -4,5 +4,8 @@
 
 void __ui_debug_printf(const char *mod, const char *fmt, ...);
 #define ui_debug_printf(args...) __ui_debug_printf(MODNAME, ## args)
+void imgui_init(void *data, int width, int height);
+void imgui_done(void);
+void imgui_render(int width, int height);
 
 #endif /* __CLAP_UI_DEBUG_H__ */
diff --git a/core/ui-imgui.c b/core/ui-imgui.c
new file mode 100644
index 0000000..987c9e8
--- /dev/null
+++ b/core/ui-imgui.c
@@ -0,0 +1,64 @@
+// SPDX-License-Identifier: Apache-2.0
+#include "common.h"
+#include "ui-debug.h"
+
+#define CIMGUI_DEFINE_ENUMS_AND_STRUCTS
+#include "cimgui.h"
+
+#ifndef __EMSCRIPTEN__
+#include <GLFW/glfw3.h>
+#include "imgui_impl_glfw.h"
+#endif
+
+#include "imgui_impl_opengl3.h"
+
+static struct ImGuiContext *ctx;
+static struct ImGuiIO *io;
+
+void imgui_render(int width, int height)
+{
+    io->DisplaySize.x = width;
+    io->DisplaySize.y = height;
+
+    ImGui_ImplOpenGL3_NewFrame();
+#ifndef __EMSCRIPTEN__
+    ImGui_ImplGlfw_NewFrame();
+#endif
+    igNewFrame();
+
+    igSetNextWindowPos((struct ImVec2){0,0}, ImGuiCond_FirstUseEver,(struct ImVec2){0,0} );
+    igShowDemoWindow(NULL);
+
+    igRender();
+    ImGui_ImplOpenGL3_RenderDrawData(igGetDrawData());
+}
+
+void imgui_init(void *data, int width, int height)
+{
+    ctx = igCreateContext(NULL);
+    io = igGetIO();
+
+    io->DisplaySize.x = width;
+    io->DisplaySize.y = height;
+
+#ifndef __EMSCRIPTEN__
+    GLFWwindow *win = data;
+    ImGui_ImplGlfw_InitForOpenGL(win, true);
+    const char *glsl_version = "#version 410";
+#else
+    const char *glsl_version = "#version 300 es";
+#endif
+
+    ImGui_ImplOpenGL3_Init(glsl_version);
+
+    igStyleColorsDark(NULL);
+}
+
+void imgui_done(void)
+{
+    ImGui_ImplOpenGL3_Shutdown();
+#ifndef __EMSCRIPTEN__
+    ImGui_ImplGlfw_Shutdown();
+#endif
+    igDestroyContext(ctx);
+}
diff --git a/demo/ldjam56/onehandclap.c b/demo/ldjam56/onehandclap.c
index b0af6c7..6852350 100644
--- a/demo/ldjam56/onehandclap.c
+++ b/demo/ldjam56/onehandclap.c
@@ -163,6 +163,7 @@ EMSCRIPTEN_KEEPALIVE void renderFrame(void *data)
 
     s->proj_updated = 0;
     models_render(&ui.mq, NULL, NULL, NULL, NULL, 0, 0, &count);
+    imgui_render(s->width, s->height);
     PROF_STEP(ui, models);
 
     s->frames_total += frame_count;