Armin Ronacher demos building Python UI apps on iPhone with a Claude agent
mitsuhiko · x · 2026-10-22
Developer Armin Ronacher (mitsuhiko) shared a hands-on demo of building a Python UI app on an iPhone using a coding agent. Screenshots show a split-screen iPhone setup running a code editor alongside a Claude agent (powered by Claude Sonnet 4.5): the agent builds a Counter app using a signal-based ui library, then autonomously spots and fixes a Python syntax error (a background keyword argument placed before positional args), with the edit-run-fix loop completing in 900ms. He notes the "make it work with iPhone Duo and make it make sense" workflow turned out surprisingly well, showing agent-driven development is viable on mobile.
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