The smallest PythonNative app: a counter with navigation to a detail screen.

From this directory, install the example's dependencies (the preview imports your real app code), then launch it. This app declares emoji in [requirements].packages, so install it locally for the preview:

pip install emoji
pn preview

A browser tab opens running app/main.py's App in a phone frame. Edit any component under app/, save, and the page Fast Refreshes in place (no simulator or device needed). See the Browser preview guide.

Leave pn preview running and, in another terminal:

pn run ios
# or
pn run android

The debug build connects to the same dev server, so saves under app/ Fast Refresh it too and its logs show up in the pn preview terminal. See the Development workflow.