Show HN: I built an app using Apple Watch's water and HR sensors to track baths

Category: devtools

Tags: health-tracking, apple-watch, wellness, sensor-fusion, ios

Score: 6.0/10 (Innovation: 7, Technical: 6, Documentation: 4, Utility: 5)

Furolog is an iOS/Apple Watch app that automatically tracks bathing and sauna sessions using the watch's water and heart rate sensors. It's interesting because it repurposes consumer hardware for niche wellness tracking with automatic activity detection and detailed physiological analysis. The app combines location-based discovery of bath facilities with personalized health metrics like thermal tolerance scores.

Target audience: health-conscious individuals, biohackers, sauna/onsen enthusiasts

Repository: https://apps.apple.com/jp/app/furolog/id6760871897

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