All integrationsAvailable in v0.2.0FIT, GPX and TCX files

Activity files data, in your own stack.

Watches, bike computers and training apps save each workout as a FIT, GPX or TCX file, and every vendor lets a person download theirs. Open Health Sync imports them with the full streams: GPS route, per-second heart rate and power.

Get API key Read the setup guide

Sources

Activity files ● uploaded 9 min ago

GET /v1/users/u_42/samples?type=heart_rate   200  38 ms
{ "type": "heart_rate", "value": 51, "unit": "bpm", "start_date": "2026-10-19T06:12:00Z", "provider": "activity_files", "source": "activity_files" }

Data types

Workouts with their GPS route
Per-second heart rate
Cycling and running power

Auth

None: the user downloads their own files or account export.

Sync

Imports each file once, from a file, a folder or a whole export.

First call

Ask for it with one request.

The request your server makes, with demo values.

{
  "type": "heart_rate",
  "value": 51,
  "unit": "bpm",
  "start_date": "2026-10-19T06:12:00Z",
  "provider": "activity_files",
  "source": "activity_files"
}

Know first

Before you start.

Works with the Garmin and Strava account exports, the COROS bulk export, and the files Wahoo, Zwift, Suunto and Polar let a user download.
No vendor API, partner program or keys of yours.
Each file is sent once, keyed by its hash, so an overlapping export stores nothing twice.
The source comes from the file itself (garmin, coros, wahoo...), and the device from the FIT product.