Heart Rate Mirror

Android app that displays live heart rate from a BLE heart rate monitor on your phone screen during workouts.

Features Connects to any standard BLE Heart Rate Profile (0x180D) device Works with Pixel Watch (1/2/3), Polar, Garmin, and BLE chest straps Large BPM display with pulse animation synced to heart rate HR zone colors — BPM display and graph segments shift from blue (rest) through green, yellow, orange, to red (max) with smooth interpolation Recent devices list — quickly reconnect to previously used devices Session history — stores up to 30 sessions with avg/max/min BPM stats and line graphs Session naming — connect straight away, then name sessions afterwards from Session History (e.g. "Morning Run"); unnamed sessions show their date Live session graph — scrolling 5-minute HR graph during active sessions Automatic reconnection — a dropped link is retried in the background without ending the session or losing the graph Sessions survive rotation and screen-off — the connection runs behind a foreground service Dark OLED-friendly theme Screen stays on while connected