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Wearables
Do Wearables Work on Darker Skin? What the Evidence Says About Heart Rate, SpO2 and Who Gets Tested
Resting heart rate mostly holds up. Exercise heart rate and blood oxygen do not always. And most of the studies behind 'validated' never tested darker skin at all.
Health Data
The 10,000 Steps Myth: What 57 Studies Say About Step Goals for Apps and Wellness Programs
The benefit curve for steps is steep at the bottom and flat near the top. A product that sets everyone a 10,000 target is aiming its motivation at the people who need it least.
Market Data
Oura's IPO: What a $15.6 Billion Smart Ring Valuation Says About the Health Data Business
Public investors are being asked to price a ring as the front door to a health subscription. The terms say it is mostly a liquidity event. The S-1 says the subscription is real. Fitbit and Peloton say the multiple is the risk.
Wearables
Why Wearable Data Arrives Late: HealthKit, Health Connect and Cloud API Sync Delays Explained
A field guide to wearable sync delay on both routes: HealthKit's hourly background cap, Health Connect's missing push, vendor-app writes, permissions that look like lag, and cloud webhooks on the vendor's clock.
All Posts
79 articles
Do Wearables Work on Darker Skin? What the Evidence Says About Heart Rate, SpO2 and Who Gets Tested
WearablesValidation
The 10,000 Steps Myth: What 57 Studies Say About Step Goals for Apps and Wellness Programs
Health DataWearables
Oura's IPO: What a $15.6 Billion Smart Ring Valuation Says About the Health Data Business
Market DataWearables
Why Wearable Data Arrives Late: HealthKit, Health Connect and Cloud API Sync Delays Explained
WearablesHealthKit
Why Google Play Rejects Health Apps, Including Ones With No Health Features
Health ConnectGoogle Play
Garmin Paused Its Developer Program. Here's How Apps Still Get Garmin Data
GarminHealth Data
Why Apps Get Rejected After Adding HealthKit
HealthKitApp Store
Can a Web App Read Apple Health?
Apple HealthHealthKit
Health Data Has Four Authorization Models, and a Cross-Platform App Is Usually Running Three
Health DataHealthKit
What It Actually Takes to Validate a Health Score
Health DataScores
What Is a Good Sleep Score? Apple's 82 Is High, Garmin's 82 Is Good, and WHOOP Is Scoring Something Else
SleepHealth Data
How Is a Readiness Score Calculated? Oura Uses Nine Inputs, Apple Uses Three, and None of Them Publish the Formula
Health DataScores
Wellness Program KPIs: Participation Is Not Engagement, and Neither Is an Outcome. The Seven Numbers to Report Instead
Health DataWellness
Three Governments Just Made Wearable Data a Regulated Input: CMS ACCESS, the NHS 10 Year Plan and the EU Health Data Space
ComplianceRegulation
Apple Watch Series 12 Health Features: Readiness, Recovery HRV, Health Age, Quest Labs and What Changed in HealthKit
AppleWearables
Health Insurance Is Copying Auto Telematics, and Health Has a Harder Problem Than Driving
Health DataWearables
The 2026 Wearable Market Is Splitting in Two, and the Health Data Is Going With the Premium Half
Market DataWearables
What Consumers Pay for Health Insight in 2026: The Price Map for Wearable Memberships, AI Coaches, Blood Panels and CGMs
Market DataWearables
Which Day Does Last Night's Sleep Belong To? Sleep Date Rules on Fitbit, Oura, Garmin, WHOOP, HealthKit and Health Connect
SleepHealth Data
Why Your Resting Heart Rate Differs by Device: Apple Measures Awake, Garmin and Oura Measure Asleep
Resting Heart RateWearables
What Is a Good HRV? Population Studies Say About 40 ms, Fitness Apps Say About 80, and Both Are Right
HRVHealth Data
Digital Health M&A in 2026: The Median Exit Takes 9.5 Years and a $7.7M Last Round
StrategyHealth Data
The Senate Rewrote HIPRA: AI Training Data Under HHS Rules, Consumer Disclosure Struck
ComplianceHealth Data
Non-Invasive Glucose Monitoring: Zero Cleared Devices, So Apple and Google Infer Instead
WearablesHealth Data
Can a Watch Detect Insulin Resistance? Google's Own Study Says It Misses 40% of Cases
WearablesHealth Data
Is Your Health App a Medical Device? After the FDA's January Guidance, Your Marketing Page Decides
ComplianceFDA
How Much Health Data Fits in an LLM Context Window? One Night of Heart Rate Costs 32,000 Tokens
AIHealth Data
Can You Feed Wearable Data to an AI? Strava Says No, Garmin Says Yes, WHOOP Says Nothing
ComplianceAI
The EU AI Act for Health Apps: The August 2026 Deadline Moved, but One Obligation Started Anyway
ComplianceEU AI Act
Google Fit's APIs Shut Down at the End of 2026: What Actually Replaces Them
GoogleHealth Connect
Building a Health Data Pipeline: The Hard Parts Nobody Warns You About
Health DataDeveloper Tools
Where Oura's 95% Sleep Accuracy Claim Actually Comes From
SleepHealth Data
Apple, Google, Whoop, Oura: What Builds a Moat in Health Data
StrategyWearables
Step Counting Accuracy: Phone vs Wrist
StepsWearables
Sleep Stages Without a Wearable: What a Phone Can and Cannot Detect
SleepSmartphone Data
Health Connect Without a Wearable: What Android Gives Your App
Health ConnectAndroid
Apple Health Without an Apple Watch: What Your App Actually Receives
Apple HealthHealthKit
Digital Phenotyping: A Developer's Guide
Digital PhenotypingHealth Data
Smartphone vs Wearable Adoption by Region: The 2026 Numbers
Health DataWearables
Bloodwork Goes Consumer: What the Whoop, Oura & Function Lab-Testing Boom Means for Health Apps
Health DataBiomarkers
The Health App Metrics That Actually Predict Retention (DAU Isn't One)
Health DataProduct
Fitbit Web API Shutdown: What Breaks in September and How to Migrate to the Google Health API
FitbitGoogle
iOS 27 for Health & Fitness Developers: GymKit on iPhone, Camera Nutrition & HealthKit
AppleWearables
The Health AI Wars: Apple, Google, Samsung, and OpenAI Are Racing to Coach You — and Data, Not Models, Will Decide It
AIHealth Data
Orthosomnia: How Sleep Trackers Are Making Us Anxious About Sleep — and What Good Design Does Instead
SleepHealth Data
WWDC 2026: What Apple's Redesigned Health App, Better Sleep Tracking, and Delayed AI Coach Mean for Developers
AppleWearables
Apple Watch vs Oura Sleep Data: Why Wearables Disagree, and How to Build On It Anyway
WearablesSleep
Google Just Unified the Android Health Stack: What Google Health, the Gemini Coach, and FHIR Medical Records Mean for Developers
Health DataAndroid
Why Most Health App Users Churn Within 90 Days — And What the Data Says About Fixing It
StrategyHealth Data
Gamification and Behavioral Nudges in Health Apps: What Works, What Doesn't, and What Health Data Changes
GamificationEngagement
AI Health Coaching Is Here: How LLMs Trained on Wearable Data Are Replacing Generic Health Advice
AICoaching
Remote Patient Monitoring Is Going Consumer: How Wearables Are Crossing the Clinical Divide
Remote MonitoringWearables
Nutrition Tracking Is Getting a Data Upgrade: AI Food Scanning, Consumer CGMs, and the Convergence With Health Data
NutritionHealth Data
Digital Mental Health Is Moving Beyond Self-Report — How Behavioral Data From Phones and Wearables Is Changing the Game
Mental HealthBehavioral Data
Corporate Wellness Is Moving From Surveys to Passive Health Data — Here's What That Means
Employee WellnessHealth Data
The State of Women's Health Data in 2026: Why FemTech Is Digital Health's Biggest Gap — and Fastest-Growing Market
Women's HealthFemTech
How Longevity Apps Are Tracking Biological Age With Wearable Biomarkers
WellnessBiomarkers
From Reactive to Predictive: How AI Is Transforming Personal Health Analytics
AIHealth Data
The State of Wearable Health Data in 2026: Market Trends, Challenges, and What Comes Next
WearablesHealth Data
How Passive Health Data Collection Works on iOS and Android (Without a Wearable)
Health DataMobile
Data-Driven Personalization in Fitness Apps: From Generic Plans to Adaptive Coaching
WellnessPersonalization
Apple HealthKit vs Google Health Connect: What Developers Need to Know
Developer ToolsMobile
How Health Insurers Are Using Wearable Data to Cut Claims and Reward Prevention
InsuranceWearables
How GLP-1 Medications Are Reshaping Digital Health and Fitness
GLP-1Weight Management
HIPAA-Compliant Health Data APIs: A Checklist for Product Teams
Privacy & ComplianceHealth Data
Build vs Buy: The True Cost of Health Data Infrastructure
InfrastructureHealth Data
The Sleep Tech Market in 2026: Why Sleep Data Is the Most Valuable Metric in Consumer Health
SleepWearables
Connected Fitness and the Gym Tech Stack: How Health Data Is Reshaping the Fitness Club Industry
FitnessWearables
The Cold-Start Problem in Health Apps: How to Personalize Before You Have Data
ProductRetention
Sahha Ships Rebuilt Data Pipeline and Overhauled SDKs Across All Platforms
AnnouncementDeveloper Tools
How to Deduplicate Health Data Across Wearables: A Developer's Guide
Developer ToolsHealth Data
How to Normalize Wearable Data Across Providers: A Developer's Guide
Developer ToolsHealth Data
Wearables, Nearables, and Ambient: A Field Guide to Health-Tracking Devices in 2025 — and What Their Data Is Actually Worth
WearablesHealth Data
Sahha Raises $1.2M to Scale Health and Wearable Data Engagement API
AnnouncementFunding
Introducing Sahha Insights: Trend Detection and Population Comparisons for Health Data
AnnouncementProduct Launch
Sahha Launches Archetypes: Dynamic Behavioral Profiling From Health and Lifestyle Data
AnnouncementProduct Launch
Real-Time Health Scores and On-Demand Biomarkers Now Available on Sahha
AnnouncementProduct Launch
Sahha Introduces Smartphone-Based Sleep Estimation After Apple Drops iPhone Sleep Tracking in iOS 18
AnnouncementProduct Launch
Sahha Launches the Readiness Score: Recovery, Strain, and Sleep in One Daily Signal
AnnouncementProduct Launch