# Striped

> Striped is a golf swing trainer for iPhone that measures swing tempo, swing
> plane, head stillness, hip rotation and swing sequencing using only the Apple
> devices a golfer already owns. There is no club sensor, no launch monitor, no
> camera rig and no extra hardware to buy, charge or clip on — the phone goes in
> your pocket and the app does the rest.

Striped is built and operated by Mongo Technologies LLC, a Wyoming limited
liability company. It is an iOS application with an Apple Watch companion.

## What makes Striped different

Almost every swing analyser on the market asks you to buy something: a sensor
that clips to the club, a launch monitor, a tripod. Striped asks for nothing you
do not already carry to the course. The measurement comes from the inertial
sensors in an iPhone, a pair of motion-capable AirPods and, optionally, an Apple
Watch.

It is also, on our own review of the field, the only app that both **paces** your
tempo and **measures** it hands-free. Metronome apps cue a rhythm but never tell
you what you actually swung. Sensor products measure a swing but need hardware.
Striped closes the loop: it cues the tempo in your ear, then tells you out loud
what you really did, on the same swing, with nothing attached to your club.

## What Striped measures

- **Tempo** — the ratio of backswing to downswing, timed from the takeaway, the
  top of the backswing and impact, plus how consistently you hold that ratio
  across a session. Tour players cluster near 3:1; Striped tells you where you
  actually are.
- **Swing plane** — the plane your backswing establishes, and how far your hands
  stray off it coming down, reported in centimetres rather than adjectives.
- **Head drift** — how far your head sways and rises through the strike, with an
  audio cue the moment it moves. Both are invisible to you while swinging.
- **Hip rotation** — how far the pelvis has turned at the top and how open it is
  at impact, phase by phase through the downswing.
- **Sequence** — wrist against hips: whether the lower body is leading the hands
  down or trailing them. The order things happen in, not just how fast.

## How it works

- **iPhone**, in your front pocket, sampling motion at ~100 Hz. Riding the pelvis
  it sees the turn away from the ball and back through it, which yields the
  takeaway, the top and impact — the three timestamps a tempo ratio is made of.
- **AirPods**, ~50 Hz. Motion-capable AirPods report head orientation, giving
  head stillness and an immediate cue when the head drifts.
- **Apple Watch**, optional, high-rate wrist motion. The watch's accelerometer
  catches the shock of impact itself rather than inferring it, tightening every
  number the app reports.

Each metric has a preferred source and degrades gracefully: with fewer devices
Striped measures less precisely and says so, rather than guessing.

## Accuracy and validation

Striped's swing detection and event timing have been validated against
frame-synchronised slow-motion video of real range sessions with real ball
strikes — not simulated swings. Detection, top-of-backswing timing and impact
timing were each measured against video ground truth and reported with their
error bars rather than asserted. Where a metric has not cleared that bar, it is
not shipped as a coaching claim.

## Requirements

- iPhone running iOS 17 or later
- Motion-capable AirPods for the head channel: AirPods Pro (all generations),
  AirPods 3rd generation or later, AirPods Max, or Beats Fit Pro. AirPods 1st
  and 2nd generation do not expose motion data.
- Apple Watch with watchOS 10 or later, optional, for the wrist channel
- No other hardware of any kind

## Privacy

Striped has no accounts, no sign-up and no password, and asks for no personal
details. Sessions are stored on your own device by default. The app contains no
advertising, no third-party analytics or crash-reporting SDK, no location access
and no tracking identifiers, and nothing is sold to anyone. Its Apple Watch
companion requests permission to write a workout to Health, with an empty read
set — it cannot see your health records and does not ask to.

## Availability

Striped is an iPhone application from Mongo Technologies LLC. It is not yet
released on the App Store; the website is the current point of contact.

## Links

- [Home](https://stripedgolfapp.com/): what Striped is, what it measures, and a
  3D replay of a tour-tempo swing driven by the app's own swing model
- [Privacy Policy](https://stripedgolfapp.com/privacy): full detail on what is
  collected, what is not, and how session data is handled
- Support and press enquiries: support@stripedgolfapp.com