Acrylic WiFi Home displays the strength of multiple Wi-Fi networks.

If you try Acrylic WiFi Home, I suggest running it in Advanced Mode (get there by clicking the settings icon in the upper right of the screen and selecting Advanced Mode). This lets you see what channel your network uses to broadcast on and which nearby networks may also be broadcasting on that channel (and the strengths of those networks). As a result, you’ll be able to find out whether there’s any interference from other networks, and then configure your network to use a different channel if needed. Homedale If you want something even simpler than Acrylic, give Homedale a try. It’s a stripped-down Wi-Fi analyzer that runs as an executable—no need for installation. It finds all nearby Wi-Fi networks and shows their SSIDs, MAC addresses, signal strength and encryption type.