The Open PRIDE HD App can be used only by Huntington’s (HD) patients participating in the sub-study of Open PRIDE HD that is managed by Teva Pharmaceutical. The Open Pride HD study is conducted to collect accelerometery data by using a wearable sensor-mobile application tool. The overall objective of the sub-study is to test the hypothesis of using wearable sensor data to estimate clinically relevant measures of HD in patients. The app also allows patients to report medication intake which would allow generating additional insights