FatigueSense

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, FatigueSense 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 warning when you may be heading toward 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 .

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

An honest, research-led approach FatigueSense is assistive and statistical. Its outputs are there to 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 always know your body best.

FatigueSense is free and grew out of doctoral research in digital health.