WiFi Signal Strength Explorer is a handy little utility which unlike the normal WiFi icon, shows you the strength of connection via dots/percent in the menu bar and by clicking it, you can access some basic details about your current network. But it also comes with a downside which is it will also disconnect you and you have to reconnect again. JamWiFi is another free little tool which can not only analyze devices connected to your wireless network, but you can also disconnect them from using your WiFi. While normally you’d need an external WiFi adapter to these kinds of things, most Macs have a network card that supports monitor mode which overall works out pretty well. WireShark is also capable of working in monitor mode, thereby letting you see what other devices are browsing/watching on your network. If you live out in the boonies with no neighbors, it won't matter. inSSIDer shows you the essential details about your Wi-Fi access points including channel, channel width, signal strength, Wi-Fi generation, maximum data rate. This is only relevant if there are nearby networks. Other channels may encounter a type of interference called 'Adjacent Channel Interference' that will cause much more trouble than 'Co-Channel Inference'.
Although it comes with a steep learning curve, it is one of the best packet analyzer apps available. NetSpot para iOS puede observar y analizar varios parámetros de la red en tiempo real. Generally there's a benefit to only using channels 1, 6 or 11. WireShark is an open source and very powerful network analyzer used mainly by network admins and developers. WiFi Scanner is a feature-complete WiFi scanner with full support for both 2.4 and 5 GHz networks and all channel bandwidths (20, 40, 80, and 160 MHz).
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