Wifi Explorer
Scan and fix Wi–Fi networks
$19.99 From Intuitibits, intuitibits.com
Needs macOS 10.13 or later
WiFi Explorer is a network scanner and analysis tool for Wi–Fi. It lists the Wi–Fi networks in the vicinity, including their SSID, MAC address, device manufacturer, signal strength, and more. It also provides a graphical illustration of the networks, so you can see where, for example, signals overlap or channels conflict. Each network is given a signal quality rating based on signal–to–noise ratio.