Find where your Wi-Fi gets weak, room by room
A question, an idea or a bug? Write to me:
rege.mathieu@icloud.com
Why doesn't the app show signal strength?
iOS doesn't give apps the raw Wi-Fi signal strength. So Wi-Fi Map measures what your Wi-Fi actually delivers in each spot: speed and latency. The 0 to 100 score on the map comes from these two measurements.
What is the camera for?
It lets your iPhone follow your position as you walk. No image is saved or sent. If you'd rather not use it, or if your device doesn't support this tracking, choose “By finger” before you start: you then move your position by dragging your finger on the map.
Why does the app ask for my location?
iOS requires this permission before an app can read the Wi-Fi network name. It isn't used for anything else: the app doesn't read your GPS coordinates. If you decline, scanning still works, without showing the network name.
How much data does a scan use?
About 1 MB per second with the default settings, or roughly 300 MB for a 5-minute scan. To use less, open Settings (the gear on the home screen) and choose “250 KB (light)” under “Data per reading”.
Does a scan use 4G or 5G?
No. Measurements go over Wi-Fi only. If the Wi-Fi drops, the reading falls to 0 instead of measuring the cellular network, and the map shows it.
The map is off or tracking gets lost. What can I do?
Walk slowly with your iPhone in front of you, and aim at places with some detail rather than a blank wall. During a scan, the app shows what to correct, such as “Move a little more slowly”. Over long distances, tracking can drift a little: several short scans work better than a very long one.
The map is red everywhere. Is it my Wi-Fi?
Not necessarily. Measurements go through a server on the internet, so a slow connection or high latency affects the whole home. It's the differences between rooms that reveal Wi-Fi weaknesses.
How do I share, rename or delete a scan?
Open the scan from the home screen. The share button at the top of the screen sends it as an image; the menu next to it lets you rename or delete it.
Can I use another test server?
Yes, in Settings › Test server. The server must return the number of bytes requested by the “bytes” parameter.
Wi-Fi Map doesn't collect any personal data and has no ads, purchases or trackers. Your scans stay on your device. To measure speed, the app downloads data from a test server, which sees your IP address like any website.
Read the full privacy policy →