watchHR is a professional heart rate monitoring and HRV app that provides real-time heart rate tracking, a smart alert system, and comprehensive workout data recording.

A low heart rate below a set low heart rate produces a single beep and vibration; a high heart rate above a set high heart rate produces two beeps and two vibrations;
A high abnormal heart rate above a set abnormal heart rate produces three beeps and three vibrations, improving upon the inherent sound alerts of the Apple Watch.

It can be used as a self-imposed exercise reminder or as a reminder when your heart rate is too high or too low, thus protecting your heart.

How to use it:

1. For first-time use, you need to set your personal profile, including gender and age, to calculate various heart rate zones.

2. Go to the settings page to set low, high, and abnormal heart rate thresholds, and set the monitoring frequency in seconds.

2. For subsequent use, simply select an exercise and press the "Start" button to return to the home page to view your heart rate, heart rate chart, and HRV changes.

*Core Features*
• Real-time heart rate monitoring and graph display
• Heart rate variability (HRV) determination
• Three-tier heart rate alert system (low, high, and abnormal)
• Low heart rate: one ring and one vibration
• High heart rate: two rings and two short vibrations
• Abnormal heart rate: three rings and three long vibrations
• Customizable heart rate thresholds
• Dual sound and vibration alerts
• Interface support in 10 languages

*Professional Features*
• Accurate heart rate algorithm, comparable to professional devices
• Intelligent exercise detection and automatic data recording
• Ad-free, focused on the exercise experience
• One-time purchase, no subscription required
• Crafted by an independent developer

*Target Audience*
• Fitness enthusiasts
• Professional athletes
• Health-conscious users
• Anyone who needs heart rate monitoring

* Health Advice Disclaimer
The information and suggestions provided by watchHR should not be considered medical advice or diagnosis, nor should they replace professional diagnosis or treatment. If you feel your heart rate is unbearable or need to make any medical decisions, Please seek medical advice immediately.

Data usage can affect the battery life of your watch. Avoid prolonged use, as this will affect the battery life.
For the price of a cup of coffee, you can enjoy a professional-grade heart rate monitoring experience. Support independent developers and let's build better health apps together!