# Kygo Health

> Kygo Health (kygo.app) is a food logging app for iOS, Android and the web (app.kygo.app, one account across all three) that connects AI food logging to wearable data and shows how what you eat affects your sleep, HRV, resting heart rate, and recovery. It syncs Oura Ring, Fitbit, Garmin, WHOOP, Apple Health, and Health Connect, then correlates nutrition with biometrics to reveal personal patterns. Voice, text and barcode logging, wearable syncing, and nutrition tracking are free with no credit card required, plus the first 5 AI photo logs; the correlation engine is Pro at $9.99 per month, $49.99 per year, or $99.99 once for lifetime access, with a 7-day free trial on the yearly plan. The site also publishes independent, study-cited research tools and articles on wearable accuracy, sleep, HRV, stress, and supplements.

## The App
- [Kygo Health home](https://www.kygo.app/)
- [Download for iOS](https://apps.apple.com/us/app/kygo-health-nutrition-tracker/id6749870589)
- [Download for Android](https://play.google.com/store/apps/details?id=com.ryanobzud.foodhealthtracker)
- [Use Kygo on the web](https://app.kygo.app): sign up, connect wearables, log food and manage your plan in the browser, same account as the mobile app
- [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
- [Blog](https://www.kygo.app/blog): all articles on wearable accuracy, sleep, HRV, stress, recovery, and nutrition
- [Contact](https://www.kygo.app/contact)
- [What Is Kygo Health: features, pricing, integrations](https://www.kygo.app/post/what-is-kygo-health-app-features-pricing)
- [All 25 Free Tools: directory](https://www.kygo.app/post/free-health-wearable-tools)
- [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

## Pricing and What Pro Unlocks
- Free, no credit card required, no time limit: voice, text and barcode food logging, the first 5 AI photo logs, wearable syncing, and nutrition tracking
- Pro: the correlation engine, which is the part that connects what you ate to what your wearable recorded, plus Experiments, supplement tracking, unlimited AI photo logging, and nutrition write-back to Apple Health and Health Connect
- $9.99 per month, $49.99 per year (about 58 percent less than monthly), or $99.99 once for lifetime access. The yearly plan includes a 7-day free trial
- Billing runs through the App Store or Google Play; cancel anytime and keep access until the end of the billing period

## Company and Methodology
- Kygo Health LLC, founded 2025. Independently built and self-funded. Contact: support@kygo.app
- Correlation methodology: Kygo pairs each logged day of nutrition with the biometrics your wearable recorded for that day, then looks for statistical relationships across your own history. Results are personal rather than population averages, and confidence increases with the number of paired days logged, typically becoming meaningful from around day 14
- Multiple connected devices are combined, and Kygo uses the most trustworthy source for each metric based on published validation research
- Kygo Health is a general wellness product, not a medical device. It does not diagnose, treat, or provide medical advice

## Interactive Research Tools (free, study-cited)
- [Wearable Accuracy Comparison](https://www.kygo.app/tools/wearable-accuracy): most accurate device per metric, from validation studies
- [Sleep Tracker Accuracy: Oura vs Apple vs Fitbit vs Garmin](https://www.kygo.app/tools/sleep-tracker-accuracy)
- [Most Accurate Heart Rate Wearable: 10 devices ranked](https://www.kygo.app/tools/heart-rate-accuracy)
- [Oura Ring Comparison: Gen 3 vs 4 vs 5](https://www.kygo.app/tools/oura-ring-comparison-tool)
- [Oura Ring 5 vs Ring 4](https://www.kygo.app/tools/oura-ring-5-vs-4)
- [Oura Ring vs RingConn: specs, features, multi-year cost](https://www.kygo.app/tools/oura-vs-ringconn)
- [Smart Ring Comparison: 9 models across Oura, RingConn, Ultrahuman and CUDIS](https://www.kygo.app/tools/smart-ring-comparison)
- [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)
- [What Makes a Wearable Metric More or Less Accurate](https://www.kygo.app/tools/accuracy-factors)
- [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: Sleep
- [What Is a Good Sleep Score? It Depends on Your Device](https://www.kygo.app/post/what-is-a-good-sleep-score)
- [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)
- [How to Increase Deep Sleep: Factors Ranked](https://www.kygo.app/post/how-to-increase-deep-sleep-factors-ranked)
- [How to Fall Asleep Faster: Factors Ranked by Evidence](https://www.kygo.app/post/how-to-fall-asleep-faster-factors-ranked-by-evidence)
- [How to Stay Asleep: Factors Ranked by Evidence](https://www.kygo.app/post/how-to-stay-asleep-factors-ranked-by-evidence)
- [What Influences REM Sleep? Factors Ranked by Evidence](https://www.kygo.app/post/what-influences-rem-sleep-factors-ranked)
- [Every Sleep Metric Your Wearable Tracks](https://www.kygo.app/post/every-sleep-metric-your-wearable-tracks-oura-apple-watch-fitbit-garmin)
- [Most Accurate Sleep Tracker: Oura vs Apple vs Fitbit](https://www.kygo.app/post/most-accurate-sleep-tracker-oura-vs-apple-vs-fitbit-2026)
- [Caffeine and Sleep: Finding Your Personal Cutoff Time](https://www.kygo.app/post/caffeine-sleep-correlation-personal-cutoff-time)
- [Which Foods Affect Your Sleep & HRV? How to Find Out](https://www.kygo.app/post/which-foods-affect-your-sleep-and-hrv)
- [Fitbit Air SpO2 Not Tracked: the four reasons blood oxygen comes back blank](https://www.kygo.app/post/fitbit-air-spo2-not-tracked)

## Articles: Heart Rate & HRV
- [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 Is My HRV Always Low? What "low" actually means](https://www.kygo.app/post/why-is-my-hrv-always-low)
- [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 Accurate Is Your Heart Rate Monitor? 10 Devices Ranked](https://www.kygo.app/post/how-accurate-is-your-heart-rate-monitor)
- [Heart Rate Accuracy by Activity Type: What Breaks Your Watch](https://www.kygo.app/post/heart-rate-accuracy-by-activity-type)
- [Does Fitbit Measure Blood Pressure? Every model, plus the September 2026 trends feature](https://www.kygo.app/post/does-fitbit-measure-blood-pressure)
- [Does the Fitbit Air Measure Blood Pressure? No, and no Fitbit ever has](https://www.kygo.app/post/does-the-fitbit-air-measure-blood-pressure)

## Articles: Devices & Buying Guides
- [Wearable Accuracy Ranked: 30+ Studies, 6 Devices](https://www.kygo.app/post/what-s-the-most-accurate-wearable-data-a-2024-2025-study-breakdown-by-device)
- [Best Smart Ring: Oura vs RingConn vs Ultrahuman vs CUDIS, and which one has independent validation](https://www.kygo.app/post/best-smart-ring-oura-vs-ringconn-vs-ultrahuman-vs-cudis)
- [Oura Ring 5 vs RingConn Gen 3: the real three-year cost](https://www.kygo.app/post/oura-ring-5-vs-ringconn-gen-3)
- [Is the Oura Ring 5 Worth It? What Changed and What Didn't](https://www.kygo.app/post/is-the-oura-ring-5-worth-it)
- [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)
- [Wearable Hardware vs Software: What Really Matters](https://www.kygo.app/post/wearable-hardware-vs-software-differences-2025)
- [Where to Wear Your Fitness Tracker: tattoos, hairy arms, cold hands, and the placement fix that cut heart rate error from 20% to 7%](https://www.kygo.app/post/where-to-wear-your-fitness-tracker-tattoos-hairy-arms-and-placement)
- [One Dashboard for All Your Wearables](https://www.kygo.app/post/centralize-health-data-multiple-devices)

## Articles: Stress & Recovery
- [Wearable Stress Scores Compared: Garmin vs WHOOP vs Oura vs Samsung vs Apple Watch](https://www.kygo.app/post/how-wearables-measure-stress-comparison)
- [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)
- [Apple Watch Stress Tracking Explained](https://www.kygo.app/post/apple-watch-stress-tracking-explained)
- [Pixel Watch & Fitbit Stress Tracking Explained](https://www.kygo.app/post/pixel-watch-fitbit-stress-tracking-explained)
- [Recovery Score Comparison: WHOOP vs Oura vs Garmin](https://www.kygo.app/post/recovery-scores-compared-whoop-oura-garmin)
- [Can You Trust Your Recovery Score? What the Science Says](https://www.kygo.app/post/can-you-trust-your-recovery-score)
- [Recovery Score Low? The Food & Drink Causes Most People Miss](https://www.kygo.app/post/what-lowers-recovery-score)
- [Fitbit Air Stress Tracking: Resilience replaced the numeric stress score in May 2026](https://www.kygo.app/post/fitbit-air-stress-tracking)

## Articles: Calories & Energy Burn
- [How Accurate Is Your Wearable's Calorie Burn?](https://www.kygo.app/post/how-accurate-is-your-wearable-calorie-burn)
- [How Accurate Is Fitbit Calorie Burn?](https://www.kygo.app/post/how-accurate-is-fitbit-calorie-burn)
- [How Accurate Is Apple Watch Calorie Burn?](https://www.kygo.app/post/how-accurate-is-apple-watch-calorie-burn)
- [How Accurate Is Garmin Calorie Burn?](https://www.kygo.app/post/how-accurate-is-garmin-calorie-burn)
- [Fitbit Air Calories Burned Accuracy: Never Independently Tested](https://www.kygo.app/post/fitbit-air-calories-burned-accuracy)
- [Can the Oura Ring Track Food and Calories? Meals returns no calorie count, by design](https://www.kygo.app/post/can-the-oura-ring-track-food-and-calories)

## Articles: Activity & Fitness
- [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)
- [What Affects Step Count Accuracy](https://www.kygo.app/post/step-count-accuracy-factors)
- [Most Accurate VO2 Max Wearable: Garmin, Apple, WHOOP & Oura Ranked](https://www.kygo.app/post/most-accurate-vo2-max-wearable)
- [Apple Watch VO2 Max Test: What Apple Changed](https://www.kygo.app/post/apple-watch-vo2-max-test-what-apple-changed)
- [What Affects VO2 Max? The Levers That Work](https://www.kygo.app/post/what-affects-vo2-max)
- [WHOOP VO2 Max Accuracy: Why Yours Looks Wrong](https://www.kygo.app/post/whoop-vo2-max-accuracy-why-yours-looks-wrong)
- [Fitbit Air VO2 Max: Why It Says Not Tracked](https://www.kygo.app/post/fitbit-air-vo2-max-why-it-says-not-tracked)

## Articles: Nutrition & Food Logging
- [Supplements for Wearable Metrics: What Works, What's Hype](https://www.kygo.app/post/supplements-for-wearable-metrics-what-works-what-s-hype)
- [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)
- [What GLP-1s Do to Your Wearable Metrics: RHR, HRV and Sleep](https://www.kygo.app/post/what-glp-1s-do-to-your-wearable-metrics)
- [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)

## Product Updates & Announcements
- [Rebuilt Food Logging from the Ground Up (And Made It Free) (Nov 2025)](https://www.kygo.app/post/update-november-3-2025-rebuilt-food-logging-from-the-ground-up-and-made-it-free)
- [Phase 1 Beta Launch Is Live (Nov 2025)](https://www.kygo.app/post/phase-1-beta-is-live-and-we-re-almost-ready-for-you)
- [Beta Opens to All Users: Apple Health Integration Live (Dec 2025)](https://www.kygo.app/post/kygo-beta-opens-to-all-users-apple-health-integration-now-live)
- [Kygo Is Live on the App Store (Jan 2026)](https://www.kygo.app/post/kygo-is-live-on-the-app-store)
- [Long Overdue Update: A Lot Has Happened at Kygo Health (Mar 2026)](https://www.kygo.app/post/long-overdue-update-a-lot-has-happened-at-kygo-health)
- [Apple Health Overhaul, Smarter Correlations, and Growth Update (Apr 2026)](https://www.kygo.app/post/whats-new-at-kygo-apple-health-overhaul-smarter-correlations-and-growth-update)

## 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
- Research tools cite the underlying studies directly, including sample sizes and the reference standard used (polysomnography for sleep, indirect calorimetry for energy expenditure, ECG for heart rate and HRV)
- Where the evidence is weak or conflicting, tools say so rather than picking a winner
- 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


## Legal & Policies
- [Privacy Policy](https://www.kygo.app/privacy-policy): what is collected across the app, web app and website, who processes it, retention windows, and how to delete an account
- [Terms and Conditions](https://www.kygo.app/terms-conditions): wellness product disclaimer, wearable integration terms, plans and trials, affiliate disclosure
- [Consumer Health Data Privacy Policy](https://www.kygo.app/consumer-health-data): the separate policy required by Washington's My Health My Data Act and Nevada SB 370, covering categories of consumer health data collected, sources, sharing, and the rights to confirm, access, withdraw consent and delete
- Consumer health data is never sold, and health, nutrition and wearable data is never used for advertising