Hstream – quick Python web apps – Streamlit alternative using htmx
I love Streamlit but have run into many situation where taking it from PoC to MVP state is insurmountable. With all the recent HN hype around htmx and sematic html / classless css I decided to build a Streamlit alternative using these on top of FastAPI. This has a couple advantages: 1) easier to extend when you move past PoC since the FastAPI app is exposed (allowing adding more routes) and hstream acts more like a typical web stack 2) with htmx and html (plus MVP.css) doing the heavy lifting the package is alot less complex and easier to reason about - and hopefully more performant…
In plain words
Hstream is a Python web framework built on FastAPI and htmx for creating interactive web applications. It serves as an alternative to Streamlit, designed for developers who need to scale proof-of-concepts into production applications. The framework exposes the underlying FastAPI app for custom extensions, uses semantic HTML and classless CSS for styling, and aims to be simpler and more performant than comparable tools. It gives developers greater control over appearance while providing sensible defaults.
written from the facts on this page · September 2026
From the sources
In the maker’s words, at launch
I love Streamlit but have run into many situation where taking it from PoC to MVP state is insurmountable. With all the recent HN hype around htmx and sematic html / classless css I decided to build a Streamlit alternative using these on top of FastAPI. This has a couple advantages: 1) easier to extend when you move past PoC since the FastAPI app is exposed (allowing adding more routes) and hstream acts more like a typical web stack 2) with htmx and html (plus MVP.css) doing the heavy lifting the package is alot less complex and easier to reason about - and hopefully more performant eventually 3) html is simple, so using this we can give the user much more control around the look and feel, while falling back onto MVP.css (classless css) sane defaults. Would love to hear people's thoughts.
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