Insights on wearable data,
health AI, and open source.
Articles on building with wearable data, health scoring algorithms, and the Open Wearables platform.
Open Wearables Release 0.5.0: Webhooks, Sleep Fixes, MCP Updates
Open Wearables 0.5.0 ships complete webhook infrastructure, incoming webhooks for Whoop and Suunto, sleep calculation fixes, HRV-CV scoring, and a new MCP Server time-series tool.
Garmin API push notifications: how callback sync works
Garmin's Health API pushes data to your callback URLs when users sync their devices. Here's how the system works end-to-end and what reliable implementation requires.
Google Health Connect integration: Android health data for developers
Google Health Connect is Android's on-device health data hub, aggregating data from Wear OS, Galaxy Watch, Fitbit, Garmin and third-party apps. Here's how to build with it.
How to connect Samsung Health to your app
The Samsung Health integration pipeline covers developer program application, OAuth 2.0, token management, data querying and normalization before you ship a single product feature.
Garmin Connect API: developer guide for activities and health metrics
Garmin's Health API uses push-based delivery and OAuth 1.0a, covering 100+ sport types, GPS, Body Battery, HRV, sleep and more. Here's what building with it actually requires.
How to access Google Health Connect data in your backend
There is no Google server-side API for Health Connect. Your Android app must read data on device and upload it. Here's the complete pipeline from setup to production.
Samsung Health API: Galaxy Watch data for developers
Samsung Health Platform provides server-side API access to Galaxy Watch data including heart rate, sleep stages, workouts, stress score, SpO2, HRV and body composition.
Strava API developer guide: activities, heart rate and GPS data
A practical guide to connecting Strava's API in production: OAuth token refresh, rate limits, webhooks, and how to normalize activity data across multiple providers.
Building a health app with Whoop API data
Getting data out of the Whoop API is one problem. Building something users find valuable is another. Here's how to use Recovery Score, HRV trends and Sleep Performance effectively in a product.
Getting Apple Health data into your backend
There is no server-side Apple Health API. Getting data to your backend means building an iOS pipeline: permissions, observer queries, background delivery and reliable upload.
Whoop API: recovery, strain and sleep data for developers
The Whoop API exposes Recovery Score, HRV, Strain and Sleep Performance through a cycle-based model. Here's how it works in practice and what building with it actually requires.
Polar API: training, HRV and Nightly Recharge data
Polar AccessLink API provides training sessions for 100+ sport types, HRV4T nightly HRV tracking, Nightly Recharge, sleep staging and VO2 max. Here's what building with it requires.
Ultrahuman API: ring data, CGM and recovery metrics
Ultrahuman Ring AIR provides Recovery Score, Sleep Score, HRV, skin temperature and movement data. Its CGM integration adds continuous blood glucose alongside recovery metrics.
Building with Ultrahuman data: recovery, sleep and glucose
Ultrahuman's combination of ring biometrics and optional CGM glucose data enables product features no other single platform supports. Here's how to build with it effectively.
How to integrate Suunto data into your training app
Suunto's altitude metrics and Training Effect scores enable outdoor sport features no other major wearable API covers with comparable depth. Here's how to use them in a product.
