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Sleep
Where Oura's 95% Sleep Accuracy Claim Actually Comes From
The same study that produces Oura's 95% also produces 76.3%. Which number you quote depends entirely on which task and which metric you pick, and nothing forces anyone to say which.
Strategy
Apple, Google, Whoop, Oura: What Builds a Moat in Health Data
The sensor stopped differentiating over a decade. The AI layer managed it in a single year. What is left is a short list of advantages that compound, and nobody is running just one of them.
Steps
Step Counting Accuracy: Phone vs Wrist
The phone is not meaningfully worse than the watch. Everything undercounts, by roughly a quarter, because real life is made of short slow bursts of walking.
Sleep
Sleep Stages Without a Wearable: What a Phone Can and Cannot Detect
Wearables do not measure REM and deep sleep either, they estimate them from proxies a phone does not have. That distinction decides what a phone-only product can honestly show.
All Posts
48 articles
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