Beat Watcher: Heart Rate Alert

This simple app is designed to do one thing well: alert you when your heart rate goes above or below the BPM thresholds you set.

Beat Watcher integrates with the Health app to read your heart rate.

Use this app as a way to listen to your body or as a continuous background tachycardia monitor or POTS tracker.

It can be great for:
- recognizing and managing stress
- breathing exercises
- meditation
- mindfulness
- working out
- monitoring for bradycardia (abnormally low heart rate)

Some users with Postural Orthostatic Tachycardia Syndrome (POTS) and Myalgic Encephalomyelitis/Chronic Fatigue Syndrome (ME/CFS) have found this app helpful for monitoring and managing symptoms.

Turn the Digital Crown on Apple Watch to set the desired BPM threshold. Then, you'll hear a sound and feel a vibration when your heart rate goes above the threshold, and a different sound and vibration when your heart rate goes back below the level you set.

Enable Low Alerts in Settings to also get notified when your heart rate drops below a second threshold you set. Monitor for both high and low heart rate conditions at the same time.

Install the free Beat Watcher companion app on your iPhone to receive phone alerts when your heart rate crosses a threshold. Turn on Critical Alerts to hear a loud sound even when your phone is on silent or Do Not Disturb. So you or a loved one can be alerted during sleep.

Optionally turn on Background Mode to continue getting haptic and audible feedback in response to your heart rate after you drop your wrist or leave the app.

Enable the Persistent Alerts setting to continue getting haptic and audible feedback every two seconds while your heart rate remains above or below your set thresholds. Or, if you just want constant heart rate monitoring without the haptic and audible feedback, you can turn Alerts off entirely.

This app also works with a Bluetooth chest strap heart rate monitor, like the Polar H10, paired with your Apple Watch. Using it this way can improve battery life of the Apple Watch when you leave Background Mode running for a long time, since your Apple Watch heart rate sensor is not running constantly. Also, this lets you continue getting audio feedback from your Apple Watch or see your heart rate on the Apple Watch screen even when you aren't wearing it, like when it's on the charger.

Note: Background Mode will not work at the same t