NetSpot is a free tool for discovering local wireless devices and creating colour-coded heatmaps.

Launch the program and it immediately detects all your local wifi devices, displaying their details in a table: SSID, BSSOD, Signal (current/ min/ max/ average), band, level, width, vendor, security, mode, and when it was last seen.

Clicking any column header sorts by that field. For example, clicking "Channel" groups devices by their channel, helping you spot competition and conflicts.

This isn't just about static figures. NetSpot displays tiny signal graphs within the table, and double-clicking any device shows graphs and tables of its signal over time, along with other interesting details (when and if the channel and security were last changed).

There's also a separate Survey mode which enables collecting and displaying wifi data on custom maps.

What's new in 2.9 (see changelog for more):

- added  Japanese localization
- added  Time-limited licenses are available
- added  Purchase, offline activation and activation code recovery options were translated to all five languages available in the app.
- improved  Survey export was improved greatly to allow saving projects with currently selected settings
- improved  Improved workflow while Wi-Fi adapter is busy
- improved  Updated the list of device vendors
- fixed  Minor interface and interactivity improvements throughout

Verdict

A good-looking, powerful yet easy-to-use wifi discovery tool.