Wifi Sentinel is a free Android app developed by GrenderG, designed to address the common issue of battery drain and excessive mobile data usage due to leaving WiFi enabled or forgetting to activate it when needed. With its simple, intuitive, and visually appealing interface, this app offers a convenient solution to manage WiFi networks.

By following a few simple steps, users can easily configure Wifi Sentinel to automatically enable or disable WiFi based on their proximity to known networks. This eliminates the need for manual switching and ensures that WiFi is only enabled when needed, saving both battery life and mobile data usage.

It's worth noting that there are some known bugs with the app on Android KitKat, specifically AOSP based roms. In these cases, removing the app from the system tray may cause the service to become "asleep". However, this can be easily resolved by restarting the service from the provided widget or ensuring that 1 process and 1 service are still running after removing the app from the system tray.

Overall, Wifi Sentinel offers a convenient solution for managing WiFi networks, helping users avoid unnecessary battery drain and mobile data usage. While there are some known bugs, the developers are actively working to resolve them, making this app a valuable tool for Android users.