Hero Band 8 is a free companion app for smart watches developed by baiyimei. It offers a range of features like step counting, heart rate monitoring, sleep tracking, and exercise tracking. The app's core function is call and SMS notification, which is pushed to the user's smart wearable device via Bluetooth 4.0. This function is only possible with the necessary permission. The app supports smart watches like P46, making it a comprehensive companion app for fitness enthusiasts.

The app's user interface is intuitive and user-friendly. It is easy to navigate and access the various features offered by the app. The step counting feature accurately records the number of steps taken by the user throughout the day. The heart rate monitoring feature is also reliable and produces accurate readings. The app's sleep tracking feature is particularly impressive, as it provides detailed information about the user's sleep patterns, including the duration of deep sleep and light sleep.

Overall, Hero Band 8 is a must-have app for anyone who owns a compatible smart watch. Its range of features and reliable performance make it a comprehensive companion app for fitness enthusiasts. The app is available for free on the Android platform.