Flux: Health & Fitness coach

Train smarter. Recover faster. Live healthier.

Flux gives you a complete picture of your health, combining recovery, sleep, strain, stress, and nutrition in one place. No guessing. Just your personal data, analyzed against your own 40-day baseline.

YOUR DAILY SCORES

RECOVERY SCORE (0–100) Know exactly how ready your body is before you train. Flux combines HRV, resting heart rate, sleep, and respiratory rate compared against your personal baseline, not population averages. High score? Push hard. Low score? Take it easy before you break down.

SLEEP SCORE (0–100) Flux tracks sleep stages, duration, awakenings, regularity, and efficiency to give you one clear number each morning. Plus a personalized Sleep Need calculation based on your age, sex, daily strain, and sleep debt.

STRAIN SCORE (0–100) Not just your workouts — your entire cardiovascular load across the day. Flux reads minute-by-minute heart rate data and tells you how much you've actually demanded from your body. Zones 0–5, from rest to VO₂ Max effort.

MORE THAN SCORES

HRV READING Measure HRV every morning in 3 ways: Bluetooth chest strap (e.g. Polar H10), Apple Watch, or your iPhone camera. Built-in artifact detection for accurate readings.

STRESS MONITOR Real-time cardiovascular stress tracking throughout your day. Detect chronic stress patterns, illness signals, and recovery trends before they become problems.

TRAINING LOAD Track long-term fitness and fatigue with ATL, CTL, and Training Stress Balance (TSB). See when you're building fitness, peaking, or risking overtraining — and adjust before it's too late.

NUTRITION TRACKING Log meals, calories, and macros (protein, carbs, fats) with access to millions of foods. Build custom recipes and meals. Understand how what you eat affects your recovery and energy.

HEALTH MONITOR An early warning system that combines biometrics and daily symptom tracking. Two scores — Illness Risk Score (IRS) and Health Status Score (HSS) — alert you before you get sick.

TRENDS & CORRELATIONS 7-day, 30-day, and 6-month trend analysis across every metric. Discover how your habits impact your sleep and recovery. Export all your data to CSV.

WORKS WITH YOUR DEVICES

Syncs with Apple Health. Compatible with Apple Watch, Garmin, Fitbit, WHOOP, Oura, and any device connected to Apple Health. Import workouts directly from Apple Health.

No wearable? No problem. Measure HRV with just your iPhone camera.

YOUR DATA. YOUR BASELINE.

Every score in Flux is calculated against your personal 40-day rolling baseline — not someone else's averages. Your body is unique. Your insights should be too.

Your health data is encrypted and never shared with third parties.

DISCLAIMER

Flux is not a medical device and does not provide medical diagnoses or treatment. Always consult a qualified healthcare professional before making decisions based on data from this app.