What is this?
Mesop is a Python-based UI framework for rapidly building web apps like demos and internal apps — it has been used at Google for rapid internal app development.
Mesop is a Python-based UI framework for rapidly building web apps like demos and internal apps — it has been used at Google for rapid internal app development.Do I need to know JavaScript, CSS or HTML to build the UI?No — it is a Python UI framework: the whole interface is written in idiomatic Python, and your custom components are just Python functions.
No — it is a Python UI framework: the whole interface is written in idiomatic Python, and your custom components are just Python functions.How do I get a first app running?Install the package with pip, copy the starter example into main.py and run the app — the README's local quickstart is exactly these three steps.
Install the package with pip, copy the starter example into main.py and run the app — the README's local quickstart is exactly these three steps.Do I need anything besides Python to try it?No — it is a pip-installable Python package you run locally, and if you want to skip installing entirely you can try Mesop in a Colab notebook in the browser.
No — it is a pip-installable Python package you run locally, and if you want to skip installing entirely you can try Mesop in a Colab notebook in the browser.Is Mesop still maintained?No. It is archived: Mesop is no longer maintained as of September 30, 2026 — no further updates, bug fixes or support will be provided.
No. It is archived: Mesop is no longer maintained as of September 30, 2026 — no further updates, bug fixes or support will be provided.Is it meant for quick internal tools or polished public products?Demos and internal apps rather than polished public products — it was used at Google for rapid internal app development and is designed to be intuitive even for UI novices.
Demos and internal apps rather than polished public products — it was used at Google for rapid internal app development and is designed to be intuitive even for UI novices.What does the developer workflow look like while I'm coding?Frictionless: the browser hot-reloads automatically and preserves state between reloads, and you get rich IDE support with strong type safety.
Frictionless: the browser hot-reloads automatically and preserves state between reloads, and you get rich IDE support with strong type safety.Can I build my own components?Yes — you compose your UI into components, which are just Python functions, and ready-to-use components ship out of the box.
Yes — you compose your UI into components, which are just Python functions, and ready-to-use components ship out of the box.Is this an official Google product?No — the README carries a disclaimer that this is not an officially supported Google product, even though it is used at Google for rapid internal app development.
No — the README carries a disclaimer that this is not an officially supported Google product, even though it is used at Google for rapid internal app development.How much code does a first Mesop app take?Less than 10 lines of Python — the README's starter example fits in under 10 lines of code.
Less than 10 lines of Python — the README's starter example fits in under 10 lines of code.Which topics is it in?web-ui, internal-tools, ui-framework, reactive, frontend-framework, google, beginner-friendly, deprecated, ui, web-app, web-development, framework
web-ui, internal-tools, ui-framework, reactive, frontend-framework, google, beginner-friendly, deprecated, ui, web-app, web-development, framework