PTrace – An iPhone Running Tracker with MCP
Tracks runs on iPhone and lets you grant an MCP-connected AI graded access to the data.
PTrace is a free iPhone running tracker that records route, distance, pace, cadence and elevation, with Apple Watch support for live heart rate. Its distinct feature: you can connect any MCP-capable AI to your training history, choosing per-connection whether it sees a summary or the precise route, and separately whether it can generate charts and workouts inside the app. Disconnecting an AI stops future access, but the developer is explicit that it does not erase data already shared with that service.
What holds up
- +Per-connection access control — choose summary-only or precise-route for each AI you connect
- +Free app with no social feed or ad tracking, unlike most fitness trackers
- +GPS plus motion sensors keep distance accurate under trees and between buildings
Mind the limits
- −Disconnecting an AI stops future access but does not erase data already shared with it
- −iPhone only, requires iOS 18 or later — no Android version
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