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Open Health Sync
Open Health Sync is an open API for wearable and health data that ingests and normalizes metrics into a single canonical model.
Open Health Sync is a self-hosted ingestion and normalization layer for health data. It pulls from providers, accepts uploads from phones, stores each payload verbatim, maps it to one canonical model with one set of units, and serves it over a REST API and a read-only MCP server. It supports thirteen sources including Apple Health, Withings, Oura, WHOOP, Fitbit, Health Connect, and Dexcom. It is designed for developers building health apps, AI agents, studies, or personal data archives. It features webhook-triggered synchronization, verbatim raw storage on disk or S3, local calendar day handling, and hard delete capabilities.
Open Health Sync at a glance
Key features
- Maps thirteen wearable sources into one canonical model
- Stores raw payloads verbatim on disk or S3
- Serves data over an OpenAPI 3.1 REST API and a read-only MCP server
- Provides FHIR R4 Observations output
- Normalizes units to a single unit per quantity
- Handles local calendar days for daily summaries
- De-duplicates re-sent uploads by content hash
Use it for
- Building a health app backend that reads a single API instead of thirteen
- Giving a desktop AI agent a read-only view of sleep and workouts through MCP
- Running a study that collects wearable data with raw payload storage
- Creating a personal data archive from health app exports
- Running small Python tools and reports on personal health data
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All Open Health Sync alternatives