A free app for Android, by JrDeveloper.

ARP Anti-Spoofing – Safe Wi-Fi is a free, reliable, and simple to use app that can detect and block all known types of ARP spoofing and poisoning attacks. It will also provide you with the information you need to know in order to protect your Wi-Fi network.

This application can also detect if your Wi-Fi network is secure or not. It will check the security of your network by checking the ARP table of the router. If the ARP table of the router is not updated, then your Wi-Fi network is considered to be vulnerable for attacks.