Tools

Small tools that run in your browser. They work offline, and nothing you type is sent anywhere.

Caffeine cutoff calculatorHow much caffeine is still in your body at bedtime, and whether each drink was early enough.
Bedtime calculatorPick your wake time and how much sleep you need. Get a bedtime, a wind-down time and a caffeine cutoff.
Bedroom setup pickerPick your climate, the season and whether you run hot or cold. Get a temperature range, humidity, duvet warmth and bedding suggestions.
Sleep diaryLog your nights, see your sleep efficiency, and get a suggested sleep window. Saved only in this browser.
Sleep score explainerPick your wearable. See what goes into its sleep score, and which pages on this site change each part.