2025-05-15 00:00:00 Based on remote PhotoPlethysmoGraphy (rPPG), the app has been developed and tested to roughly estimate Heart Rate (HR). Different devices have different computational speed. Users are highly suggested to slide the bar at the bottom to adjust for the suitable error rates until green colors occur for accurate estimations. The app is supported by the research project (ITB/FBL/9037/22/S) funded under Innovation and Technology Fund for Better Living (FBL) in Hong Kong. However, it should be reminded that the app is still experimental and not meant to replace any physical connected sensor. After usage, users should still seek for advices from qualified professionals. Disclaimer: