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A surprisingly large number of the apps I built on tools.simonwillison.net were built on my phone - either by copying and pasting code out of Claude Artifacts or using the Codex and Claude Code features in the official ChatGPT and Claude iPhone apps
tools.simonwillison.nettools.simonwillison.net
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My most sophisticated mobile-phone-only project is probably this one, where I scraped an event website and then built and deployed an alternative UI for browsing the schedule entirely from my phone, while out for a social coffee simonwillison.net/2025/Jul/17/...
simonwillison.netVibe scraping and vibe coding a schedule app for Open Sauce 2025 entirely on my phoneThis morning, working entirely on my phone, I scraped a conference website and vibe coded up an alternative UI for interacting with the schedule using a combination of OpenAI Codex …