Health tools
Small tools for everyday health questions
Estimate, log, and spot trends — everything runs in your browser and personal records never leave this device.
All tools
Sleep cycle calculator
Work out good times to wake up or go to bed, based on 90-minute sleep cycles.
Sleep log and trends
Log bed and wake times to see average duration, schedule consistency, and recent trends.
Home blood pressure log
Log systolic, diastolic, and pulse readings with automatic classification, averages, and export.
Caffeine timing estimator
Estimate how caffeine decays in your body over time and whether it may affect tonight's sleep.
BMI and TDEE estimator
Calculate BMI and estimate basal metabolic rate and daily energy needs with the Mifflin-St Jeor equation.
Period tracker and prediction
Log period start dates to predict the next period and fertile window. Data stays on this device.