Swift Student Challenge winner, 2025
Tremor Check
Built for my grandfather.
Tremor Check measures vocal tremor and fine-motor control in people with Parkinson's, entirely on device. It won Apple's 2025 Swift Student Challenge.
I built it for my grandfather, who carried a binder to every appointment to log his symptoms by hand. I wanted to give him something easier, and more dignified.
You repeat a few phrases, then hold a finger still. The app scores both, keeps the history, and makes a PDF to hand to the doctor.
- Year
- 2025
- Runs on
- iPad, iPhone
- Built with
- SwiftUI, SwiftData, Speech, Accelerate, ARKit, PDFKit, Swift Charts
How it is built
What it listens for
Jitter, shimmer, harmonic-to-noise ratio and pitch entropy, taken from 30 millisecond frames of each phrase with outliers removed.
A finger test
Hold a finger still on the screen and the app turns the drift into a stability score out of 100.
Something to hand the doctor
Every check is kept, charted by week, month and year, and exported as a PDF report.
See the voice box
A 3D model of the larynx shows which muscles and ligaments the tests are measuring.
Next project
Quiet Mind