WHOOP already has amazing recovery, sleep, HRV and strain tracking, but the picture feels incomplete without native hydration and calorie/macronutrient tracking.
A simple water tracker with quick-add buttons, daily goals and reminders would immediately improve daily use.
A nutrition tracker, even a basic one, could make WHOOP much more valuable: calories, macros, meal timing, caffeine, alcohol and late meals could be connected directly to recovery, RHR, HRV and sleep quality.
The real value would not just be logging food, but showing personal insights like: “On days when you eat late, your recovery drops,” or “Low hydration correlates with higher resting heart rate.”
Also, broader language support would make the product much more attractive internationally. WHOOP is a premium subscription product, and full localization would increase retention and make the app feel more complete.