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New York, NY​

ryan@kygo.app

© 2025 by KYGO Health LLC Kygo Health LLC is not intended to diagnose, treat, cure, or prevent any disease. The information provided is for educational purposes only and is not a substitute for professional medical advice. Consult your physician before making any health decisions.

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All 25 free Kygo tools

Every tool is free, study cited, browser based, and requires no signup.

Wearable accuracy

Wearable Accuracy Comparison (/tools/wearable-accuracy): real accuracy data for Oura, Apple Watch, Garmin, WHOOP, Fitbit and Samsung across 9 metrics from 17+ peer reviewed studies. Heart Rate Accuracy, 10 wearables ranked on median MAPE and CCC against ECG and chest strap reference (/tools/heart-rate-accuracy). Calorie Burn Accuracy Calculator (/tools/calorie-burn-accuracy). Step Count Accuracy (/tools/step-count-accuracy). VO2 Max Accuracy (/tools/vo2-max-accuracy). Sleep Tracker Accuracy, 7 wearables against sleep lab polysomnography (/tools/sleep-tracker-accuracy). Hardware and Software Differences (/tools/sensor-comparison). What Makes a Wearable Metric More or Less Accurate, the moderators that change how accurate any device is (/tools/accuracy-factors).

Device comparisons

Oura Ring Gen 3 vs 4 vs 5 (/tools/oura-ring-comparison-tool). Oura Ring 5 vs Ring 4, upgrade verdict and 3 year cost (/tools/oura-ring-5-vs-4). Oura vs RingConn, 5 models on specs, software features and true multi year cost with subscriptions (/tools/oura-vs-ringconn). Fitbit Air vs WHOOP (/tools/fitbit-air-vs-whoop-comparison). Sleep Metrics by Wearable (/tools/sleep-metrics). Smart Ring Comparison, 9 models across Oura, RingConn, Ultrahuman and CUDIS (/tools/smart-ring-comparison). Recovery Score Explorer, 12 wearables (/tools/recovery-score-explorer).

Sleep factors

Sleep Latency Factors, 33 factors (/tools/sleep-latency-factors). Deep Sleep Factors, 28 factors (/tools/deep-sleep-factors). Staying Asleep Factors, 27 factors (/tools/staying-asleep-factors). REM Sleep Factors (/tools/rem-sleep-factors).

Recovery and heart

HRV Factor Explorer, 38 factors (/tools/hrv-factors). Resting Heart Rate Factors, 37 factors (/tools/resting-heart-rate-factors). VO2 Max Factors (/tools/vo2-max-factors). Stress Factor Explorer (/tools/stress-factors).

Nutrition

Supplements by Metric, 6 metrics with effect sizes and funding flags (/tools/supplements-by-metric). AI Calorie Scanner (/tools/calories-in-anything).

The tools show research averages. The Kygo app finds your personal correlations by connecting food logging with your Oura, Fitbit, Garmin, WHOOP, Apple Health or Health Connect data. Food logging, wearable syncing, and nutrition tracking are free, including your first 5 AI photo logs. Pro, which unlocks the correlation engine, costs $9.99 per month, $49.99 per year with a 7 day free trial, or $99.99 once for lifetime access. Kygo is a general wellness product, not a medical device.