WifiMapper is a WiFi mapping app for Android and the web. Walk a building, a street or a whole campus with your phone, and WifiMapper records every WiFi network it hears and plots it on a map: each SSID, each access point, and how strong the signal was at every point you passed. It is the quickest way to map WiFi signal strength without hauling out survey gear.
Start mapping WiFi free See how it works
Free Android app. No account needed - your map lives on the phone until you choose otherwise.
The Android app scans in the background and tags every reading with GPS. Each sample carries the SSID, the access point's BSSID, the channel frequency and the signal strength in dBm, so your WiFi map shows real measurements rather than guesses.
Pick any SSID and the WiFi map draws its samples as dots sized by signal strength. The cluster of biggest dots is your access point. It is a fast way to track down a rogue AP, confirm a mesh node moved, or find the router behind an unlabelled network.
Every point you scanned from shows on the map, whether or not a network answered. The blank stretches between them are exactly the WiFi coverage holes worth fixing - no heat-map guesswork required.
WifiMapper stores the channel centre frequency with every sample, so a dual-band router or a mesh system shows up as the separate radios it really is. Mapping WiFi band by band is how you spot a 5 GHz network that drops out long before 2.4 GHz does.
Samples upload to your account and stay there. Come back a month later and compare WiFi coverage before and after you moved an access point, changed a channel, or added a repeater.
WifiMapper only listens. It never joins the networks it maps, needs no credentials, and touches no controller or router configuration - so you can survey WiFi anywhere you are allowed to stand.
Network installers checking a WiFi site survey before they quote. IT teams chasing a dead spot in an office. Home users working out where to put a mesh node. Anyone who needs to know where the WiFi actually reaches, mapped on real ground rather than on a floor plan.