Note: All methods are approximate. Finger is most accurate but not a medical device.
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BPM
Initializing...
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Signal Quality
Raw Signal
FFT Spectrum
Microphone Measurement
Hold phone to your chest
Press start and move phone to chest within 5 seconds
High beep = recording starts, low beep = recording ends
Stay quiet during recording
Recording lasts 10 seconds
Ready
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BPM
Raw Audio
How It Works
This app measures heart rate using your camera by detecting color changes in your skin.
Face Mode
Uses AI face detection to find your face, then measures color changes in your forehead. Works best with good lighting and minimal movement.
Finger Mode
Place your finger over the camera lens. Uses light absorption changes to detect pulses through your skin. More accurate than face mode.
Technical Details
Both methods use photoplethysmography (PPG) - the same principle as medical pulse oximeters. Blood absorbs green light, so heartbeats cause tiny color changes we detect and amplify.
Accuracy
Not a medical device. For recreational use only. Use a medical pulse oximeter for accurate readings.