Interactive Health Tools
36 free interactive tools for sleep, fitness, nutrition, health monitoring, and wearable technology.
10 health markers reveal your biological age vs actual age.
10-question quiz: Lion, Bear, Wolf, or Dolphin — with personalized schedule.
Adjust 6 factors to see real-time sleep score and architecture.
Find optimal bedtime or wake time based on 90-minute cycles.
Track weekly sleep debt and get a personalized recovery plan.
Get the perfect nap type, duration, and timing for your schedule.
Optimal melatonin dose and timing for sleep, jet lag, or shift work.
Calculate recovery score and training readiness from HRV data.
5 training zones with Karvonen method and calorie estimates.
Estimate cardiovascular fitness and percentile ranking.
Pace, time, splits for 5K to marathon with zone indicators.
Estimate 1RM from submaximal lifts with percentage table.
Predict finish times for all distances from one known race result.
Track acute vs chronic load and training stress balance.
30+ activities with MET values, food equivalents, weekly projection.
Daily calories and protein/carb/fat split for your goal.
Personalized daily water target with hourly drinking schedule.
16:8 to OMAD countdown with metabolic phase tracking.
See how much caffeine is in your system at bedtime.
BAC timeline, time to sober, sleep and hangover impact.
Sun exposure, skin type, latitude — estimate your D production.
Body fat %, BMI, lean mass via US Navy method.
AHA category, cardiovascular risk, lifestyle recommendations.
8-factor risk scoring with CGM and doctor recommendations.
5 formulas compared: Devine, Robinson, Miller, Hamwi, BMI.
Next period, ovulation, fertile window with 3-month calendar.
Enter blood test results and get plain-English explanations.
15-question quiz: how closely you live like the world's longest-lived people.
Box Breathing, 4-7-8, Wim Hof — animated guide with HRV impact.
Cold shower/ice bath timer with hormonal response estimates.
Eye strain, sleep disruption, and 20-20-20 schedule.
Day-by-day light, sleep, caffeine plan for timezone changes.
4-question quiz with personalized recommendations from 14+ devices.
Compare 1-5 year ownership cost including subscriptions.
Compare 30+ features across 20 devices side by side.
Toggle features on/off to see real-world battery estimates.
Interactive visual guides to PPG, ECG, accelerometer, SpO2, and more.
Check if your phone works with your wearable device.
Find the perfect health device by budget and lifestyle.
Animated guides to sleep tracking, HRV, GPS, CGM, and more.
Ready to take control of your health with AI?
Unify your wearable data, track your biomarkers, and get AI-powered health recommendations.