Wrist telemetry in. Verdict out. Raw motion stays on your paired watch and phone.
Swing is the golf surface inside the Proto iOS app. Install once, and the watch extension goes with it. Raw high-rate motion stays on your paired devices. Derived swing summaries can sync to Proto's servers. Connected health data is processed server-side, encrypted in transit and at rest. How privacy works.
Currently in TestFlight. Public App Store release when the founding cohort closes.
The iOS app installs the watchOS extension. The watch reads motion. The phone runs the math. Your biomarker panel — MyChart, Function Health, or a lab PDF — stays inside the vault on your device.
No Apple Health export. No third-party server. No swing feed uploaded to a cloud. Proto returns a verdict — tempo score, load, next-round dose — and writes a receipt to your ledger.
Apple owns the wrist. Proto owns the verdict.