--- title: "Blog, page 5" description: "Older posts from the Open Wearables blog, page 5: release notes, provider API guides and building with self-hosted health data." canonical_url: "https://openwearables.io/blog/page/5" --- # What shipped, and how to build with it. Blog Release notes every couple of weeks, guides to the provider APIs and their quirks, and the occasional longer piece on getting health data into a shape you can work with. [Get started](https://openwearables.io/docs/quickstart) [Book a demo](https://openwearables.io/book) ## Posts Whoop · May 6, 2026 · 9 min read ### 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. Garmin · May 6, 2026 · 7 min read ### 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 · May 6, 2026 · 7 min read ### 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. Google Health Connect · May 6, 2026 · 7 min read ### 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. Whoop · May 6, 2026 · 6 min read ### 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. Apple Health · May 6, 2026 · 6 min read ### 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. Polar · May 5, 2026 · 8 min read ### 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 · May 5, 2026 · 6 min read ### 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. Ultrahuman · May 5, 2026 · 6 min read ### 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. Strava · May 4, 2026 · 5 min read ### How to integrate Strava without building OAuth from scratch Building a production Strava integration means writing OAuth, token refresh, webhooks and rate limit logic before shipping any product. Here's what that actually takes, and a simpler path. Suunto · May 4, 2026 · 6 min read ### 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. Apple Health · May 4, 2026 · 7 min read ### Apple HealthKit API: what data you can access and how HealthKit is an on-device framework, not a remote API. There is no server-side Apple Health endpoint. Here's what's available, how permissions work, and what building an integration really requires. The platform ## Looking for the product rather than the post? ### [Platform](https://openwearables.io/platform) ### [Integrations](https://openwearables.io/integrations) ### [Pricing](https://openwearables.io/pricing)