What IcuSync does with your data

Plain language, no legal jargon.

Your training data is never stored by IcuSync

When you ask Claude a question about your training, here is what happens:

  1. 1Claude sends the request to IcuSync.
  2. 2IcuSync fetches the data from Intervals.icu in real time using your approved connection.
  3. 3The result is returned to Claude. Nothing is saved on IcuSync's servers.

Your training history, workouts, fitness metrics, and wellness data all stay where they have always lived: on Intervals.icu.

How IcuSync connects to your account

IcuSync is listed as an approved app in Intervals.icu. You can see it yourself under Settings → Apps in your Intervals.icu account. Apps listed there must comply with Intervals.icu's API Terms and Conditions.

When you connect your Intervals.icu account, IcuSync stores one thing: an access token you approve. This is the standard way every connected fitness app works. Strava uses it. TrainingPeaks uses it. The app that syncs your Garmin or Wahoo uses it.

The token lets IcuSync read and write to your Intervals.icu account on your behalf. It does not contain your password and does not give access to anything outside Intervals.icu. IcuSync connects via OAuth only and does not ask for, store, or use your Intervals.icu API key. You can revoke access at any time in Intervals.icu under Settings → Apps → IcuSync, or disconnect directly from your IcuSync dashboard.

The complete list of what IcuSync stores

  • Your email address and hashed password, to run your account
  • Your Intervals.icu OAuth token, encrypted, to authenticate your connection
  • Subscription and billing status, processed by Stripe
  • Basic usage logs for up to 90 days, for debugging. These do not contain your training data.

IcuSync is hosted on Railway in the United States (Virginia). Your training data is not stored there: it remains on Intervals.icu's own servers, which are hosted in Germany and Finland within the EU. Full details are in the Privacy Policy.