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Full Python GUI apps in the browser

no JavaScript, no server

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I have been working on Dear ImGui Bundle since 2022, but it is the first time I talk about it here. It is a framework around Dear ImGui for building interactive applications in Python and C++. It comes with batteries included: Plotting, image inspection, Markdown, node editors, 3D gizmos, knobs, toggles, etc.https://imgui-bundle.pages.devIt now also runs smoothly in the browser via pyodide: The playground below is a python app running in your browser (no server, no JavaScript). You can edit the code on the left and click Run. It even works on mobile.https://imgui-bundle.pages.dev/playgroundI have a strong interest in providing tools that help others express their creativity. This project aims to be a step in this direction as it helps develop GUIs where the code is extremely readable & hackable.Some of the goals it addresses:- Bring true Immediate Mode GUI to Python and C++- A versatile range of high quality libraries: Widgets, Plots, Image Analysis, Node edition, markdown rendering- Multiplatform apps in C++: works on all platform in C++ (desktop, mobile, emscripten)- Deploy python apps to the web- High quality python bindings that are always up-to-date (because they are auto-generated)- Smooth transition between C++ and Python (same APIs for both)I'd be happy to answer questions!

HN · launched May 7, 2026 · 29 upvotes (top 21%) · 0 views

Niche: software development frameworks · 154 launches, 2 in the last 7 days ▼ -89% · Explore this niche →

Category and tags
  • Horizontal
  • Dev tools
  • Developer
  • Not AI
  • Hobby / open-source project

Visit website ↗ Source listing ↗

More like this: all 154 launches in software development frameworks →

Could you build this?

No Compiling Dear ImGui and complete Python/C++ GUI runtimes to WebAssembly with comprehensive graphics, markdown, and node-editor bindings is an extensive multi-year systems engineering endeavor.

What it would actually take: The stack uses Emscripten, WebGL/WebGPU, Pyodide, and pybind11 to compile C++ GUI libraries (Dear ImGui, ImPlot, ImNodes) and Python runtime into browser WASM. The hard part is managing cross-compilation toolchains, maintaining binary compatibility, C++/Python binding generators, and handling high-performance rendering loops inside the browser event loop. Requires senior expertise in WebAssembly, native C/C++ build systems, and graphics programming.

Discussion

16 comments analyzed.

Competitors mentioned: ImPlot3D, DOM-based widgets, Macromedia Flash

Concerns raised: Initial download size (10 MB total for pyodide + wheel), Page load time on mobile (30 seconds), Complex mixed technology stack required (Python/HTML/CSS/React/JS/Node), Not practical for basic browser UX compared to JavaScript, Need to open engine for complex use cases like reasonable refresh rates

Feature requests: True 3D bindings for rendering meshes in OpenGL/WebGL with custom shaders, Java bindings equivalent, Browser caching for wheel and pyodide to reduce reload times

Competitors

Other products that read as similar to this one : 75 launches clear the similarity bar, closest 8 shown.

Attention rank: #19 of 76 (itself plus its competitors, highest first, normalized so YC and Product Hunt are compared fairly).

Launched 185 days after the earliest competitor.

Related data

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