Only tells you how many devices are connected.
Just a basic scanner. A better app would be one from the maker of your router. For instance, ASUS has a great iPad app for their routers. You can do everything from it. If you want to know WHAT those devices are, simply log into your router to see the MAC address of each and look them up online. If you’ve never logged into your router you probably never changed the default password, and if you’ve never changed the default password, you deserve to get hacked.