Open Wearables Launches Open-Source Health Scoring Algorithms for Wearable Data

Health scores from wearables have always been proprietary. Whoop’s recovery score, Oura’s readiness score, Garmin’s Body Battery: the formulas behind these numbers are protected IP, invisible to the developers, researchers, and clinicians who build on top of them.

Open Wearables, an open-source health intelligence platform built and maintained by healthtech studio Momentum, has published the first open-source health scoring algorithms for wearable data. Starting with a sleep score and a resilience score, every formula is available in the public repository, line by line. More scores are planned for the coming months.

Each score is a documented algorithm that any developer can read, verify, and deploy. A sports science team can tune thresholds for elite performance. A clinical application can calibrate parameters for a specific patient population. A wellness platform can fork the scoring layer and adapt it to its own methodology. The algorithms ship versioned alongside the rest of the platform, with every change tracked in the open.

The scoring models were designed and validated by Anna Zych, PhD, a neuroscientist from the Max Planck Institute for Biological Intelligence who serves as Health Science Lead at Momentum. The scores are grounded in peer-reviewed research, not engineering approximations.

Open Wearables connects all major wearable providers through a unified API: Apple Health, Garmin, Whoop, Oura, Polar, Suunto, Strava, Fitbit, Samsung Health Connect, Ultrahuman, and Google Health Connect. The platform normalizes data across sources, handles OAuth flows, and computes standardized health scores on top of that unified data layer. It runs on the developer’s own infrastructure, carries no per-user fees at any scale, and is MIT licensed.

“When we started Open Wearables, the first job was clear: build a stable foundation. A unified data ecosystem that takes the fragmented mess of wearable health data and turns it into something builders can actually work with. With open health scores, we’re taking the next step: giving teams the intelligence layer they need so they can focus on what makes their product different,” said Piotr Sędzik, CEO and Co-founder of Momentum.

The Science Behind Wearables

The release of open scoring algorithms arrives alongside a new scientific publication. “The Science Behind Wearables” is a Substack newsletter authored by Anna Zych, PhD, writing for health enthusiasts and product builders. Each issue examines the research behind the metrics wearable devices track daily: how HRV baselines form, what sleep stages actually measure, how recovery scores correlate with physiological markers, and what the data does and does not reveal. The newsletter is available at thesciencebehindwearables.substack.com.