Circadian Cardiogram 4+

Circadian Rhythm of Heart Rate
Cardiogram is a modern minimalistic, reliable app that will help accurately monitor and record your heart rate in real-time to help keep track of your health and performance. Just power on your sensor and start the app - it’s that easy!

Cardiogram is one of the few apps that do not require you to create an account, all information is stored locally and thereby protected from any data leaks or privacy scandals. No personal data is sent to any servers, all the information is stored directly on your iPhone and Apple Health app only.
The app is integrated with Apple HealthKit to sync and record heart-rate data.

Sun Intervals is a sunset & sunrise minimalist tracking app that offers a range of helpful and reliable information regarding sun movements about the length of day and night based on your exact location anywhere in the world. Using a functional diagram and easy to read interface, Sun Intervals displays exactly how much daylight remains while also allowing you to enable notification alerts for sunrise, sunset, first and last light times the minutes set before the event.
Religious and yoga followers can benefit from the application as well to observe special requirements.