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Welltory measures HRV through your phone camera and turns it into a daily stress and energy score. The HRV-stress-cortisol-skin chain is real…
UVLens markets itself as a personalized hourly UV forecaster with a Fitzpatrick-tuned avatar. The data is competent. The reminders are the actual…
SunSafe promises a 10-day UV forecast, skin-type-aware burn-risk scoring, and a safe-tanning module that estimates an even-tan progress curve. In 2026, with…
Sun Day is Jack Dorsey's open-source UV and vitamin D tracker, launched on TestFlight in July 2025. Single screen, auditable code, and…
Stardust is the prettiest period tracker on the App Store, with a moon-phase layer, daily hormone forecasts, and a ritual-minded interface. The…
SpotMyUV is the clinically validated UV-detection sticker that turns purple when your sunscreen wears off. After 14 days across pool, hike, and…
SkinSort's Routine Creator turns its ingredient database into a routine builder that flags clashes between products. The warnings are sharp. The auto-suggested…
Skinskool returns a percentage match between a luxury product and its supposed drugstore dupe based on ingredient overlap. The math is honest.…
SkinGenie promises a free AI-built routine from a 9-factor selfie scan. In practice it is a decision tree wearing the costume of…
Skin Rocks is Caroline Hirons' app, and the value is exactly what you would expect: her curation, her cheat sheets, her photo…