Wi-Fi Checker is a free app on Android devices that can help you analyze, check and protect your wireless internet connection. What this app does is that it scans signals, congests signal, and shows you multiple WiFi channel ratings. It's a powerful tool that can control your network in real time and can detect any issues your internet is facing.

It overall improves your network performance by monitoring your WiFi, stopping all apps using the network in the background, and ensuring your online security. You can also see who's been using your WiFi through its detailed information of all connected devices, including your personal Wi-Fi hotspots.