Description

Your pulse as a trace, a sound and a light.
Heart Rate FX turns your watch into a bedside monitor. It reads the optical sensor and shows every beat three ways at once: a sweeping ECG-style trace, a short monitor beep through the speaker, and the backlight swelling in time with your heart.

Where the watch reports the interval between two measured beats, the app follows those intervals rather than an averaged number, so the rhythm on screen is the rhythm in your chest. The status line says "Live" then.

FEATURES
- Sweeping trace that draws a P-QRS-T complex for every beat
- Monitor beep at 880 Hz, held on a stream so the amplifier cannot click between beats
- Backlight that pulses with the beat, in any colour, at an adjustable floor
- Vibration click on every beat, for quiet rooms and watches with no speaker
- Beep pitch, volume, trace speed and trace colour adjustable
- Demo pulse for showing the app without a sensor
- English, German, French, Spanish, Italian, Dutch, Portuguese, Polish, Swedish

BUTTONS
- Select: vibration on or off
- Up: sound on or off
- Down: step through what the backlight does
- Down, held: demo pulse on or off

Settings live in the Pebble app on your phone, under the gear next to Heart Rate FX.

The speaker and the colour backlight exist only on the Pebble Time 2. Other watches get the trace and the vibration, and leave the backlight alone.

This is not a medical device. The trace is drawn from the intervals the watch measures; it is a picture of your pulse, not a recorded ECG.

Vibe coded from start to store. That is the only reason it exists alongside a full time job.

The app is free and has no ads. If you enjoy it, a coffee is much appreciated: https://buymeacoffee.com/SIDEffects