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Latest

Google Health Guardian on Pixel Watch: Blood Pressure and Insulin Resistance Trends Without FDA Clearance

Google shipped blood pressure and insulin resistance trends as wellness features, and the first reports surprised people. What they measure, how accurate the underlying research is, and how it differs from Apple's FDA-cleared approach.

Oct 5, 2026

VO2 Max

How Accurate Is VO2 Max on Apple Watch and Garmin? What the Validation Studies Show

Wearable VO2 max is good for tracking change and weak for classifying one person. What the validation studies show for Apple Watch and Garmin, why the error flips with fitness, and how products should use it.

Oct 4, 2026

Glucose

Over-the-Counter CGMs: Dexcom Stelo, Abbott Lingo and the Glucose Data Market for People Without Diabetes

Stelo and Lingo turned CGMs into a consumer product. What they measure, who buys them, what the evidence supports, and how glucose data actually reaches your app.

Oct 3, 2026

Heart Health

Can a Smartwatch Detect AFib? What the Apple, Fitbit and Samsung Evidence Actually Shows

Smartwatches can flag and even record atrial fibrillation. What the Apple Heart Study, Fitbit Heart Study, EQUAL trial and meta-analyses show, what cardiology guidelines accept, and where the data goes.

Oct 2, 2026

All Posts

90 articles

Three Governments Just Made Wearable Data a Regulated Input: CMS ACCESS, the NHS 10 Year Plan and the EU Health Data Space

ComplianceRegulation Sep 11, 2026

Which Day Does Last Night's Sleep Belong To? Sleep Date Rules on Fitbit, Oura, Garmin, WHOOP, HealthKit and Health Connect

SleepHealth Data Sep 6, 2026

Google Just Unified the Android Health Stack: What Google Health, the Gemini Coach, and FHIR Medical Records Mean for Developers

Health DataAndroid May 28, 2026

Wearables, Nearables, and Ambient: A Field Guide to Health-Tracking Devices in 2025 — and What Their Data Is Actually Worth

WearablesHealth Data Nov 20, 2025

Blog

Latest

Google Health Guardian on Pixel Watch: Blood Pressure and Insulin Resistance Trends Without FDA Clearance

How Accurate Is VO2 Max on Apple Watch and Garmin? What the Validation Studies Show

Over-the-Counter CGMs: Dexcom Stelo, Abbott Lingo and the Glucose Data Market for People Without Diabetes

Can a Smartwatch Detect AFib? What the Apple, Fitbit and Samsung Evidence Actually Shows

All Posts

Google Health Guardian on Pixel Watch: Blood Pressure and Insulin Resistance Trends Without FDA Clearance

How Accurate Is VO2 Max on Apple Watch and Garmin? What the Validation Studies Show

Over-the-Counter CGMs: Dexcom Stelo, Abbott Lingo and the Glucose Data Market for People Without Diabetes

Can a Smartwatch Detect AFib? What the Apple, Fitbit and Samsung Evidence Actually Shows

Do Doctors Use Wearable Data? 97% Have Looked at It, 6% or Fewer Have It in Their Workflow

How Wearable Stress Scores Are Calculated: Garmin, WHOOP, Oura, Samsung and Fitbit Compared

Cuffless Blood Pressure Wearables: Apple Hypertension Notifications, Samsung, Hilo and What Is Cleared

Can a Smartwatch Detect Sleep Apnea? What Apple's and Samsung's FDA-Cleared Features Actually Measure

The Smart Ring Market in 2026: Oura, Samsung Galaxy Ring, Ultrahuman, RingConn and Garmin's Cirqa

Wearables and Adults Over 65: The Ownership Gap Medicare Programs Have to Close

How Many People Still Wear Their Wearable After Six Months? What a Decade of Abandonment Data Shows

Do Wearables Work on Darker Skin? What the Evidence Says About Heart Rate, SpO2 and Who Gets Tested

The 10,000 Steps Myth: What 57 Studies Say About Step Goals for Apps and Wellness Programs

Oura's IPO, Postponed: What a $15.6 Billion Smart Ring Valuation Says About the Health Data Business

Why Wearable Data Arrives Late: HealthKit, Health Connect and Cloud API Sync Delays Explained

Why Google Play Rejects Health Apps, Including Ones With No Health Features

Garmin Paused Its Developer Program. Here's How Apps Still Get Garmin Data

Why Apps Get Rejected After Adding HealthKit

Can a Web App Read Apple Health? HealthKit, PWAs, Capacitor and the Apple Health API Explained

Health Data Has Four Authorization Models, and a Cross-Platform App Is Usually Running Three

What It Actually Takes to Validate a Health Score

What Is a Good Sleep Score? Apple's 82 Is High, Garmin's 82 Is Good, and WHOOP Is Scoring Something Else

How Is a Readiness Score Calculated? Oura Uses Nine Inputs, Apple Uses Three, and None of Them Publish the Formula

Wellness Program KPIs: Participation Is Not Engagement, and Neither Is an Outcome. The Seven Numbers to Report Instead

Three Governments Just Made Wearable Data a Regulated Input: CMS ACCESS, the NHS 10 Year Plan and the EU Health Data Space

Apple Watch Series 12 Health Features: Readiness, Recovery HRV, Health Age, Quest Labs and What Changed in HealthKit

Health Insurance Is Copying Auto Telematics, and Health Has a Harder Problem Than Driving

The 2026 Wearable Market Is Splitting in Two, and the Health Data Is Going With the Premium Half

What Consumers Pay for Health Insight in 2026: The Price Map for Wearable Memberships, AI Coaches, Blood Panels and CGMs

Which Day Does Last Night's Sleep Belong To? Sleep Date Rules on Fitbit, Oura, Garmin, WHOOP, HealthKit and Health Connect

Why Your Resting Heart Rate Differs by Device: Apple Measures Awake, Garmin and Oura Measure Asleep

What Is a Good HRV? Population Studies Say About 40 ms, Fitness Apps Say About 80, and Both Are Right

Digital Health M&A in 2026: The Median Exit Takes 9.5 Years and a $7.7M Last Round

The Senate Rewrote HIPRA: AI Training Data Under HHS Rules, Consumer Disclosure Struck

Non-Invasive Glucose Monitoring: Zero Cleared Devices, So Apple and Google Infer Instead

Can a Watch Detect Insulin Resistance? Google's Own Study Says It Misses 40% of Cases

Is Your Health App a Medical Device? After the FDA's January Guidance, Your Marketing Page Decides

How Much Health Data Fits in an LLM Context Window? One Night of Heart Rate Costs 32,000 Tokens

Can You Feed Wearable Data to an AI? Strava Says No, Garmin Says Yes, WHOOP Says Nothing

The EU AI Act for Health Apps: The August 2026 Deadline Moved, but One Obligation Started Anyway

Google Fit's APIs Shut Down at the End of 2026: What Actually Replaces Them

Building a Health Data Pipeline: The Hard Parts Nobody Warns You About

Where Oura's 95% Sleep Accuracy Claim Actually Comes From

Apple, Google, Whoop, Oura: What Builds a Moat in Health Data

Step Counting Accuracy: Phone vs Wrist

Sleep Stages Without a Wearable: What a Phone Can and Cannot Detect

Health Connect Without a Wearable: What Android Gives Your App

Apple Health Without an Apple Watch: What Your App Actually Receives

Digital Phenotyping: A Developer's Guide

Smartphone vs Wearable Adoption by Region: The 2026 Numbers

Bloodwork Goes Consumer: What the Whoop, Oura & Function Lab-Testing Boom Means for Health Apps

The Health App Metrics That Actually Predict Retention (DAU Isn't One)

Fitbit Web API Shutdown: What Breaks on 30 October and How to Migrate to the Google Health API

iOS 27 for Health & Fitness Developers: GymKit on iPhone, Camera Nutrition & HealthKit

The Health AI Wars: Apple, Google, Samsung, and OpenAI Are Racing to Coach You — and Data, Not Models, Will Decide It

Orthosomnia: How Sleep Trackers Are Making Us Anxious About Sleep — and What Good Design Does Instead

WWDC 2026: What Apple's Redesigned Health App, Better Sleep Tracking, and Delayed AI Coach Mean for Developers

Apple Watch vs Oura Sleep Data: Why Wearables Disagree, and How to Build On It Anyway

Google Just Unified the Android Health Stack: What Google Health, the Gemini Coach, and FHIR Medical Records Mean for Developers

Why Most Health App Users Churn Within 90 Days — And What the Data Says About Fixing It

Gamification and Behavioral Nudges in Health Apps: What Works, What Doesn't, and What Health Data Changes

AI Health Coaching Is Here: How LLMs Trained on Wearable Data Are Replacing Generic Health Advice

Remote Patient Monitoring Is Going Consumer: How Wearables Are Crossing the Clinical Divide

Nutrition Tracking Is Getting a Data Upgrade: AI Food Scanning, Consumer CGMs, and the Convergence With Health Data

Digital Mental Health Is Moving Beyond Self-Report — How Behavioral Data From Phones and Wearables Is Changing the Game

Corporate Wellness Is Moving From Surveys to Passive Health Data — Here's What That Means

The State of Women's Health Data in 2026: Why FemTech Is Digital Health's Biggest Gap — and Fastest-Growing Market

How Longevity Apps Are Tracking Biological Age With Wearable Biomarkers

From Reactive to Predictive: How AI Is Transforming Personal Health Analytics

The State of Wearable Health Data in 2026: Market Trends, Challenges, and What Comes Next

How Passive Health Data Collection Works on iOS and Android (Without a Wearable)

Data-Driven Personalization in Fitness Apps: From Generic Plans to Adaptive Coaching

Apple HealthKit vs Google Health Connect: What Developers Need to Know