• HeartCloud has integrated Apple, Inc.'s official movement disorder functionality into its patient-facing iPhone and Apple Watch app
• It tracks tremor severity and likelihood of dyskinetic symptoms on a minute-by-minute basis
• Clinical research: "Smartwatch inertial sensors continuously monitor real-world motor fluctuations in Parkinson's disease." - Science Translational Medicine Vol. 13, No. 579 (2021)

From page 46 of Apple's annual healthcare report: