Lifestyle & Wellness
Sleep debt, stress index, hydration target, caffeine intake, and lifestyle health tools.
Caffeine Half-Life Calculator
Model caffeine decay based on CYP1A2 genetics and lifestyle factors....
OpenCaffeine Half-Life Calculator
Calculate caffeine decay over time based on CYP1A2 genetics. Estimates when caff...
OpenChronotype Calculator (rMEQ)
Determine your chronotype (morning type, evening type, or intermediate) using th...
OpenChronotype Calculator (rMEQ)
Determine your chronotype using the reduced Morningness-Eveningness Questionnair...
OpenCold Plunge Calculator
Cold water immersion protocol: 11 minutes/week at 10-15°C....
OpenWeekly Exercise Minutes Tracker
Track weekly exercise against WHO/AHA guidelines (150 min moderate + 2 strength ...
OpenDaily Hydration Tracker
Personalized water intake goal based on body weight and activity....
OpenJet Lag Calculator
Light exposure timing for jet lag recovery based on time zones crossed....
OpenLight Exposure Tracker
Track daily lux-hours for circadian rhythm optimization....
OpenMood & Nutrition Journal Analyzer
Free mood and nutrition journal tracker. Log meals, sleep, and mood for 7-14 day...
OpenNEAT Estimator
Non-Exercise Activity Thermogenesis from daily activities....
OpenSauna Dose Calculator
Calculate weekly sauna protocol per Søberg principle: 57 min/wk hot, 11 min/wk c...
OpenScreen Time Impact Calculator
Estimate health effects of daily screen time on sleep, eyes, and metabolism....
OpenScreen Time & Health Impact Calculator
Free screen time calculator estimates your daily total and impact on sleep, eye ...
OpenSitting Breaks Calculator
Every 30-min sitting break recommendation and daily sitting time tracking....
OpenSleep Cycle Calculator
Calculate optimal bedtime/wake time based on 90-minute sleep cycles....
OpenSleep Debt Calculator
Calculate accumulated sleep debt over the past week....
OpenStep Cadence Calculator
Calculate walking intensity: 100+ steps/min = moderate activity....
OpenStress Index Calculator (PSS-10)
Free PSS-10 stress index calculator measures perceived stress using Cohen's...
OpenStress Index (PSS-10)
Validated 10-item Perceived Stress Scale for psychological stress assessment....
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