Flet is just a standalone python library which can be get by just pip install flet[all] command. That's all you have to do...
Flet has no dependencies, instead you can test and develop UI using --web then build the needed apk/ipa later in a dedicated system.
So, there's no need to add a python library out of box.

Flet is just a standalone python library which can be get by just pip install flet[all] command. That's all you have to do... Flet has no dependencies, instead you can test and develop UI using --web then build the needed apk/ipa later in a dedicated system. So, there's no need to add a python library out of box.

Flet has several dependencies and all but two of them are included in WinPython.

I propose adding a modern UI library since Streamlit has some deficiencies. It is good for prototyping and quick dashboards but is not suitable for more complex web apps and it cannot generate a native/non-browser UI.

Flet is the best option I’ve found, powered by Flutter. NiceGUI is a close second but it cannot generate native UIs and requires more transient dependencies than Flet. Even the devs of NiceGUI acknowledge the cons of Streamlit here:

We at Zauberzeug like Streamlit but find it does too much magic when it comes to state handling. In search for an alternative nice library to write simple graphical user interfaces in Python we discovered JustPy. Although we liked the approach, it is too "low-level HTML" for our daily usage. But it inspired us to use Vue and Quasar for the frontend.

We have built on top of FastAPI, which itself is based on the ASGI framework Starlette and the ASGI webserver Uvicorn because of their great performance and ease of use.

If there’s reluctance to add another UI library to WinPython, I would suggest at least adding sv-ttk to make tkinter somewhat tolerable to look at.

Toga (and Briefcase) from BeeWare are also promising, but I’m not sure the maturity level is quite there yet.

sv-ttk is a pertinent remark ==> added on all versions.

The search for a simple web equivalent to tcl-tk is still on the Christmas list.

for flet, I don't know: popularity is still very low vs streamlit

There is flet and nicegui... they are not exactly small
Nicegui is 15Mo, flet just 0.5 Mo, before dependency tax.

Toga is in beta but looks promising as it targets all platforms. Learned about it on a recent Talk Python To Me podcast, BeeWare and the State of Python on Mobile.

Toga:
https://github.com/beeware/toga
https://toga.readthedocs.io/en/stable

sv-ttk is a pertinent remark ==> added on all versions.

https://github.com/albertosottile/darkdetect
https://github.com/Akascape/py-window-styles

These seem to be some complementary packages. First one simply reads a registry key to determine light mode/dark mode, second one adds various window visual styles and works with many of the Python GUi libs.

The search for a simple web equivalent to tcl-tk is still on the Christmas list.

Looks like web widgets are planned:

https://toga.readthedocs.io/en/stable/reference/widgets_by_platform.html

flet is rather small, all thing considered, but needs a separated flutter engine ??

toga seems interesting, but still years away:

• https://beeware.org/news/buzz/2025q2-roadmap/
• https://toga.readthedocs.io/en/latest/reference/widgets_by_platform.html
• BeeWare and the State of Python on Mobile - Talk Python to Me Ep. 499

flet is rather small, all thing considered, but needs a separated flutter engine ??

I think flet takes care of that under the hood. It uses a web server (Fletd) that bridges Python and Flutter. pip install flet should provide everything needed.

To run a flet app, you can use flet run app.py or execute the script directly with python app.py.

I don't see Flet exploding in use as Streamlit does... I guess we neeed to see what Flet-1.0 gives

Sounds good! I think winpython is otherwise using nice and mature GUI libs (pyqt being the big one).

On the CLI side, I see there is click, may want to check out typer which adds some nice syntactic sugar to click using type hints (maintained by same dev as fastapi).

typer is ok: 25k added in total