Library / SDK
Apps & UIsCoding
Mesop
1Google's 2Python 3framework 4for 5rapid 6UIs
the six Ws · specification
W1
Who
Internal tool builders and AI app prototypers, notably at Google.
W2
What
Mesop is a Python UI framework for rapidly building web apps and internal tools using idiomatic Python.
W3
Where
Self-hosted, runs as a standard Python web server with hot reload for local development.
W4
When
Open sourced by Google and actively maintained with over 6,500 GitHub stars.
W5
Why
Used internally at Google for rapid internal app development and offers a low friction path for developers new to web UI.
W6
With
Built in Python with no required JavaScript, CSS or HTML knowledge to build a working UI.
W7
Watch
Apache 2.0 open source project maintained by Google engineers, fully self-hosted with no vendor cloud dependency.
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