20 Free Health & Wearable Tools From Kygo (No Signup)
- Ryan - Kygo Health
- Jul 19
- 4 min read
Updated: 12 hours ago
Kygo publishes 20 free health and wearable tools at kygo.app/tools. Every tool is built from peer reviewed research, none require signup, and all run in your browser. They cover wearable accuracy by metric, sleep and HRV factors ranked by evidence, device comparisons with real validation data, calorie burn accuracy, and supplement effects. This page lists all 20 with what each one does.
Why free? The tools answer the research questions we kept getting asked, and they demonstrate the evidence first approach behind the Kygo app. Each tool cites its studies and flags manufacturer funded research so you can weigh it accordingly.
Wearable accuracy tools
These compare devices against gold standard measurements from validation studies, metric by metric.
Wearable Accuracy Comparison: the flagship tool. Compare real accuracy data for Oura, Apple Watch, Garmin, WHOOP, Fitbit and Samsung across 9 health metrics, backed by 17 or more peer reviewed studies with full funding disclosure.
Sleep Tracker Accuracy: 7 wearables benchmarked against lab polysomnography on four stage staging agreement, deep and REM detection, sleep wake agreement and total sleep time bias, with every stat flagged vendor funded or independent. Every device hits 89 to 95 percent sleep sensitivity but only 27 to 52 percent wake specificity.
Calorie Burn Accuracy Calculator: enter your wearable’s reported calorie burn and see the likely actual range, backed by 7 or more peer reviewed studies.
Step Count Accuracy: which wearable counts steps most accurately, ranked by 20 or more peer reviewed studies.
VO2 Max Accuracy: which wearable estimates VO2 max best, with independent versus vendor validation separated. Only Garmin and Apple have genuine independent validation.
Hardware & Software Differences: what actually makes Garmin, WHOOP, Oura, Apple Watch and Fitbit different: sensors, health metrics, and proprietary software compared.
Device comparison tools
Oura Ring Comparison: Gen 3 vs 4 vs 5: dimensions, sensor architecture, peer reviewed validation and 3 year cost of ownership including membership, side by side.
Fitbit Air vs WHOOP Comparison: Fitbit Air, WHOOP 5.0 and WHOOP MG compared by sensors, battery, price, health metrics and 3 year cost.
Sleep Metrics by Wearable: all 38 sleep metrics tracked by Oura, Fitbit, Apple Watch and Garmin across 10 categories, so you can see exactly what each device measures.
Recovery Score Explorer: what actually moves recovery and readiness scores across 12 wearables including WHOOP, Oura, Garmin, Fitbit and Samsung, broken down by signal, direction and evidence.
Sleep factor explorers
Each explorer ranks the factors that move one sleep outcome, with evidence strength, doses, and mechanisms from the research.
Sleep Latency Factors: 33 research backed factors that affect how fast you fall asleep.
Deep Sleep Factors: 28 factors that affect deep sleep, ranked from 40 or more studies.
Staying Asleep Factors: 27 research backed factors that affect whether you stay asleep through the night.
REM Sleep Factors: alcohol, sleep timing, temperature, exercise, supplements and demographics, ranked by evidence strength.
Recovery and heart tools
HRV Factor Explorer: 38 research backed factors that affect heart rate variability, from supplements to lifestyle to demographics.
Resting Heart Rate Factors: 37 factors that move your resting heart rate, sorted by exact bpm impact.
VO2 Max Factors: what raises or lowers VO2 max across training, nutrition, environment and lifestyle.
Stress Factor Explorer: what moves your wearable stress score on Garmin, WHOOP, Oura, Fitbit, Samsung and Apple Watch, by signal and evidence.
Nutrition tools
Supplements by Metric: supplement effects across 6 metrics, sleep latency, deep sleep, staying asleep, HRV, resting heart rate and recovery, with verified effect sizes, evidence grades and funding flags.
AI Calorie Scanner: point it at any food, or honestly anything, and get a calorie estimate. The fun one.
How the tools grade evidence
Every factor and accuracy claim traces to a named study, and the tools separate three tiers that most content blends together: independent peer reviewed validation, manufacturer funded studies (labeled as such), and mechanistic or preliminary findings. Where a small sample drives a claim, the tool says so. That structure is why the factor explorers rank items by evidence strength rather than by hype, and why the accuracy tools can show you when a device’s marketing number comes from its own funded research.
How these tools connect to the Kygo app
The tools tell you what the research says on average. The Kygo app tells you what your own data says. It connects food logging with your Oura, Fitbit, Garmin, WHOOP, Apple Health or Health Connect data and finds the correlations specific to your body. Details on features and pricing are in What Is Kygo Health, and the research method behind the accuracy tools is in our 17 study wearable accuracy breakdown.
FAQ: Kygo free tools
Are the Kygo tools really free?
Yes. All 20 tools are free, browser based, and require no signup or email. They are funded by the Kygo app, not by ads or data sales.
Where does the tool data come from?
Peer reviewed validation studies and research papers, cited inside each tool. Manufacturer funded studies are labeled so you can weigh them against independent work.
Do the tools work on mobile?
Yes, every tool runs in a mobile browser as well as desktop.
Which tool should I start with?
The Wearable Accuracy Comparison is the most complete: 6 devices, 9 metrics, 17 or more studies. If you own a specific device, start with its comparison or factor tool.