Who's on my wifi

It is not only detecting devices on your WIFI network but it includes all the devices connected to your network, like your wired connected pc (without a WIFI possibility in it) on your network. So don't block "unknown" devices too quickly until you are sure this is a really unknown device. :-P So because of the little misleading name of the app and not clearly showing which devices are or are not connected via WIFI: no 5 stars.

I should add that this app also lists your router, with a link to its "configuration page". That will take you to another link to download the manufacturer's app for access to your router configuration. In a sense, that somewhat creates redundancy, but I can live with it. The creators of this app are very generous, so I'm going with 5 stars.

Easy to start using, and the copy/share function is good to have. Loses one star because naming the second tab Recents (plural) makes you expect all previous checks to be logged, but in fact only the latest one is there - I'd have made my own note of which were connected and disconnected, if I'd known I couldn't see this later. Otherwise, a quick start guide is needed, especially a glossary - I know IP and MAC but what is MSK?! - but overall this is a handy little app.