Simple Run is a free health and fitness app developed by Andrey Zhuravlev for Android 9.0 users. It is an auxiliary application designed for runners that contains several tools for calculating heart rate zones, speed, pace, distance, and cadence. It also features an interval timer and a function to track indicators during a run.

One of the most notable features of Simple Run is its synchronization with smartwatches. It works with almost any smartwatch running Google Android OS, and users can access features such as the interval timer, heart rate zones, and running metrics on their WearOS devices. With the interval timer, users can start and manage a workout on their watch, while the heart rate zones and running metrics are read from the phone app. The workout works synchronously in the phone, allowing users to count time, distance, and pace in real-time.

Overall, Simple Run is a useful and accessible app for runners of any level. Its synchronization with smartwatches and range of features make it a great addition to any runner's toolkit.