FatigueSense

Manage your energy levels

FatigueSense helps you understand your energy and pace your days, so you can do more of what matters with less risk of crashing.

Built by digital health researchers, it links data from your wearable with quick daily check-ins to show how your activity, recovery, and fatigue relate over time. It is designed with and for people living with persistent fatigue — ME/CFS, long COVID, fibromyalgia, cancer-related fatigue, and other long-term conditions.

What you can do • See your daily energy budget and how much you have left • Get an early signal when you may be approaching post-exertional malaise (PEM) • Track strain, recovery, HRV, resting heart rate, and sleep in one place • Plan activities that fit within your personal energy envelope • Log crashes and check-ins so the app learns your individual patterns • Connect a wearable, or use manual daily entry — no device required

Works with your wearable Apple Watch, Oura, Garmin, WHOOP, Polar, Withings, Fitbit, and more.

An honest, research-led approach FatigueSense is assistive and statistical. Its outputs complement your own judgment — they do not diagnose or treat any condition, and they are not validated for every diagnosis. Fatigue is not one thing, and the app does not assume all conditions behave the same way. You know your body best.

FatigueSense is a wellness and self-management app. It is not a medical device and is not intended to diagnose, treat, cure or prevent any disease. Energy estimates, pacing guidance and symptom risk indicators are informational only and are not medical advice. Always speak to a qualified healthcare professional about your health, and before changing anything about your treatment or care. If you think you are having a medical emergency, contact your local emergency services.