I shipped a paid web app in half a day using Claude Code + Codex (Garmin AI CSV converter)

Note: This article reflects information as of May 2026. What I built Garmin AI Export — a web app that converts the activity, sleep, and health data ZIP exported from Garmin Connect into clean CSVs that ChatGPT, Gemini, and Claude can readily analyze. 🔗 https://garmin-ai-export.vercel.app If you've worn a Garmin watch for years, you've accumulated a massive trail of data: runs, sleep records, heart rate, stress, Body Battery — all of it. Garmin Connect lets you export everything, but what you g