Standby
GATT Sniffer
A Web Bluetooth inspector for the Heart Rate Service. Connect a BLE strap, watch the raw notification bytes arrive frame by frame, and decode them live into beats per minute, heart-rate variability, and accumulated strain.
Heart Rate
--bpm
0x2A37 · HR valueHRV · RMSSD
--ms
RR window · n=0Strain · TRIMP
--au
Banister training impulseBPM tracelast 0 frames
no signal
Raw GATT notifications0x2A37 · little-endian
No bytes captured yet.
Scan for a heart-rate device, or run the live simulation to stream synthetic 0x2A37 frames.
interact ai and interact are fictional entities and do not exist in reality. This tool runs entirely in your browser; no biometric data leaves your device.