Free Health Tools
Interactive calculators to help you optimize sleep, audit your supplement stack, check recovery readiness, and plan your first health experiment. No account needed.
Sleep Score Calculator
Estimate your sleep quality based on your habits — bedtime, caffeine, screen time, and more.
Try it free →Supplement Stack Audit
Check your supplement stack for interactions, redundancies, and timing conflicts.
Try it free →Recovery Readiness Quiz
Find out if your body is ready to train hard today or if you should back off.
Try it free →Caffeine Half-Life Calculator
See how much caffeine is still in your system at bedtime based on when you drank it.
Try it free →Experiment Builder
Design a structured health experiment with a baseline period, active test, and tracking plan.
Try it free →Intermittent Fasting Calculator
Design your fasting window, calculate eating times, and estimate autophagy onset based on your chosen protocol.
Try it free →Biological Age Calculator
Estimate your biological age based on lifestyle factors — exercise, sleep, diet, stress, and more.
Try it free →GLP-1 Weight Loss Calculator
Model your expected weight loss journey on semaglutide or tirzepatide with dose escalation timeline and cost estimates.
Try it free →Supplement Timing Optimizer
Get a personalized daily schedule for when to take your supplements — and which combinations to separate.
Try it free →Vitamin D Dosage Calculator
Calculate your optimal vitamin D dose based on current blood levels, body weight, skin tone, and sun exposure.
Try it free →Magnesium Dosage Calculator
Find the right magnesium dose and form for your goal — sleep, muscle recovery, stress relief, or general health.
Try it free →Creatine Loading Calculator
Calculate your loading and maintenance doses for creatine based on body weight, with a saturation timeline.
Try it free →Hormone Panel Analyzer
Visualize where your hormone levels fall within research-backed optimal ranges. Enter your lab results and get a color-coded breakdown across testosterone, thyroid, cortisol, and more.
Try it free →GLP-1 Protein Calculator
Calculate protein targets for muscle preservation during GLP-1 therapy. Based on STEP trial data and muscle protein synthesis research.
Try it free →Supplement Comparison Tool
Compare supplement forms side-by-side — bioavailability, cost per serving, timing, and evidence strength for each form.
Try it free →Supplement Interaction Checker
Check your supplements for known interactions, timing conflicts, and absorption blockers. Enter two or more supplements to see potential issues.
Try it free →Personal Stack Builder
Answer questions about your goals, current metrics, and budget to get a personalized supplement stack with timing schedule.
Try it free →Supplement Budget Calculator
See your monthly and yearly supplement costs, cost per serving, and find more cost-effective alternatives for your stack.
Try it free →HRV Improvement Quiz
Answer 10 questions about your habits, supplements, and sleep to get ranked interventions by expected HRV impact.
Try it free →Wearable Comparison Tool
Compare Oura Ring, WHOOP, Apple Watch, and Garmin across HRV accuracy, sleep staging, battery life, price, and more.
Try it free →Blood Pressure Protocol Builder
Enter your current blood pressure and lifestyle factors to get supplement and behavior recommendations with a tracking plan.
Try it free →Experiment Duration Calculator
Enter your supplement type and target metric to get a recommended experiment length, measurement frequency, and washout period.
Try it free →HRV by Age Calculator
See where your HRV ranks against population norms for your age decade. Supports Apple Health (SDNN) and Oura, WHOOP, Garmin (rMSSD) measurements.
Try it free →