# Kygo Health
 
> Kygo Health (kygo.app) is an iOS and Android app that connects AI food logging to wearable data and shows how what you eat affects your sleep, HRV, resting heart rate, energy, and recovery. It syncs Oura Ring, Fitbit, Garmin, WHOOP, Apple Health, and Health Connect, then correlates nutrition with biometrics to reveal personal patterns. Free tier available; Premium is $39.99/year with a 7-day free trial, or $9.99/month. The site also publishes independent, study-cited research tools and articles on wearable accuracy, sleep, HRV, stress, and supplements.
 
## The App
 
- [Download for iOS](https://apps.apple.com/us/app/kygo-nutrition-wearables/id6749870589)
- [Download for Android](https://play.google.com/store/apps/details?id=com.ryanobzud.foodhealthtracker)
- [How It Works](https://www.kygo.app/how-it-works): connect a wearable, log food with AI (photo, voice, barcode, or text), get correlations between your nutrition and your biometrics
- [FAQ](https://www.kygo.app/faq): pricing, supported devices, data privacy
- [Why I Built Kygo](https://www.kygo.app/post/why-i-built-kygo-health-app): founder story
- [Privacy Policy](https://www.kygo.app/privacy-policy): personal and health data is never sold to third parties
## Interactive Research Tools (free, study-cited)
 
- [Wearable Accuracy Comparison](https://www.kygo.app/tools/wearable-accuracy): most accurate device per metric, from validation studies
- [Oura Ring Comparison: Gen 3 vs 4 vs 5](https://www.kygo.app/tools/oura-ring-comparison-tool)
- [Fitbit Air vs WHOOP Comparison](https://www.kygo.app/tools/fitbit-air-vs-whoop-comparison)
- [Sleep Metrics by Wearable](https://www.kygo.app/tools/sleep-metrics)
- [Sensor & Hardware Comparison](https://www.kygo.app/tools/sensor-comparison)
- [Calorie Burn Accuracy by Device](https://www.kygo.app/tools/calorie-burn-accuracy)
- [Step Count Accuracy](https://www.kygo.app/tools/step-count-accuracy)
- [VO2 Max Accuracy by Device](https://www.kygo.app/tools/vo2-max-accuracy)
- [VO2 Max Factors](https://www.kygo.app/tools/vo2-max-factors)
- [HRV Factor Explorer](https://www.kygo.app/tools/hrv-factors)
- [Resting Heart Rate Factors](https://www.kygo.app/tools/resting-heart-rate-factors)
- [Deep Sleep Factors](https://www.kygo.app/tools/deep-sleep-factors)
- [REM Sleep Factors](https://www.kygo.app/tools/rem-sleep-factors)
- [Staying Asleep Factors](https://www.kygo.app/tools/staying-asleep-factors)
- [Sleep Latency Factors](https://www.kygo.app/tools/sleep-latency-factors)
- [Stress Factors by Wearable](https://www.kygo.app/tools/stress-factors)
- [Recovery Score Explorer: 12 Wearables](https://www.kygo.app/tools/recovery-score-explorer)
- [Supplements by Metric](https://www.kygo.app/tools/supplements-by-metric)
- [AI Calorie Scanner](https://www.kygo.app/tools/calories-in-anything)
## Articles: Wearable Accuracy & Comparisons
 
- [Wearable Accuracy Ranked: 17 Studies, 6 Devices](https://www.kygo.app/post/what-s-the-most-accurate-wearable-data-a-2024-2025-study-breakdown-by-device)
- [Most Accurate Sleep Tracker: Oura vs Apple vs Fitbit](https://www.kygo.app/post/most-accurate-sleep-tracker-oura-vs-apple-vs-fitbit-2026)
- [How Accurate Is Your Wearable's Calorie Burn?](https://www.kygo.app/post/how-accurate-is-your-wearable-calorie-burn)
- [How Accurate Is Garmin Calorie Burn?](https://www.kygo.app/post/how-accurate-is-garmin-calorie-burn)
- [How Accurate Is Apple Watch Calorie Burn?](https://www.kygo.app/post/how-accurate-is-apple-watch-calorie-burn)
- [How Accurate Is Fitbit Calorie Burn?](https://www.kygo.app/post/how-accurate-is-fitbit-calorie-burn)
- [Which Wearable Has the Most Accurate Step Count?](https://www.kygo.app/post/which-wearable-has-the-most-accurate-step-count-a-2024-2025-research-analysis)
- [Wearable Hardware vs Software: What Really Matters](https://www.kygo.app/post/wearable-hardware-vs-software-differences-2025)
- [Every Sleep Metric Your Wearable Tracks](https://www.kygo.app/post/every-sleep-metric-your-wearable-tracks-oura-apple-watch-fitbit-garmin)
- [Oura Ring 5 vs Ring 4: Is the Upgrade Worth It?](https://www.kygo.app/post/oura-ring-5-vs-ring-4-is-the-upgrade-worth-it-evidence-based)
- [Fitbit Air vs WHOOP: Which Screenless Tracker Wins?](https://www.kygo.app/post/fitbit-air-vs-whoop-which-screenless-tracker-is-worth-it)
- [Recovery Score Comparison: WHOOP vs Oura vs Garmin](https://www.kygo.app/post/recovery-scores-compared-whoop-oura-garmin)
## Articles: Stress Tracking
 
- [Wearable Stress Scores Compared: Garmin vs WHOOP vs Oura vs Samsung vs Apple Watch](https://www.kygo.app/post/how-wearables-measure-stress-comparison)
- [Apple Watch Stress Tracking Explained](https://www.kygo.app/post/apple-watch-stress-tracking-explained)
- [Oura Ring Stress: Daytime, Resilience & Cumulative Explained](https://www.kygo.app/post/oura-ring-stress-tracking-explained)
- [WHOOP Stress vs Recovery Explained](https://www.kygo.app/post/whoop-stress-score-recovery-explained)
- [Pixel Watch & Fitbit Stress Tracking Explained](https://www.kygo.app/post/pixel-watch-fitbit-stress-tracking-explained)
## Articles: HRV, Heart Rate & Sleep
 
- [How to Improve HRV: Factors Ranked by Evidence](https://www.kygo.app/post/how-to-improve-hrv-factors-ranked-by-evidence)
- [Why Did My HRV Drop? 12 Common Causes](https://www.kygo.app/post/why-did-my-hrv-drop-12-common-causes-and-what-your-food-log-reveals)
- [Why Alcohol Crushes Your HRV and How Long Recovery Takes](https://www.kygo.app/post/why-does-alcohol-crush-your-hrv-and-how-long-until-it-recovers)
- [Resting Heart Rate Factors Backed by Research](https://www.kygo.app/post/resting-heart-rate-factors)
- [Why Is My Resting Heart Rate Suddenly Higher?](https://www.kygo.app/post/why-is-my-resting-heart-rate-suddenly-higher-a-data-driven-breakdown)
- [How to Increase Deep Sleep: Factors Ranked](https://www.kygo.app/post/how-to-increase-deep-sleep-factors-ranked)
- [What Influences REM Sleep? Factors Ranked by Evidence](https://www.kygo.app/post/what-influences-rem-sleep-factors-ranked)
- [How to Stay Asleep: Factors Ranked by Evidence](https://www.kygo.app/post/how-to-stay-asleep-factors-ranked-by-evidence)
- [How to Fall Asleep Faster: Factors Ranked by Evidence](https://www.kygo.app/post/how-to-fall-asleep-faster-factors-ranked-by-evidence)
- [Caffeine and Sleep: Finding Your Personal Cutoff Time](https://www.kygo.app/post/caffeine-sleep-correlation-personal-cutoff-time)
- [Why Is My Sleep Score Low When I Slept 8 Hours?](https://www.kygo.app/post/why-is-my-sleep-score-low-when-i-slept-8-hours)
- [What Affects Step Count Accuracy](https://www.kygo.app/post/step-count-accuracy-factors)
## Articles: Nutrition & Using the App
 
- [Oura Ring Food Tracking: Complete Guide](https://www.kygo.app/post/oura-ring-food-tracking-complete-guide)
- [Oura Ring Nutrition Tracking: Connect Food to Sleep](https://www.kygo.app/post/oura-ring-nutrition-tracking-connect-food-to-sleep)
- [One Dashboard for All Your Wearables](https://www.kygo.app/post/centralize-health-data-multiple-devices)
- [Why 80% of People Quit Food Logging Apps](https://www.kygo.app/post/why-80-of-people-quit-food-logging-apps-and-how-to-actually-stick-with-it)
## AI Agent Access
 
This site is powered by Wix and supports the Model Context Protocol (MCP). AI agents can retrieve live site content directly, no scraping required.
 
- [Site MCP Endpoint](https://www.kygo.app/_api/mcp)
## Trust & Editorial Standards
 
- Every accuracy claim links to peer-reviewed validation studies; manufacturer-funded studies are labeled as such
- Kygo Health is a general wellness product, not a medical device; content is educational, not medical advice
- Health data is not sold to third parties; wearable access uses Apple HealthKit and Android Health Connect permission models