What a Wi-Fi analyzer shows and how to read it

A Wi-Fi analyzer shows every Wi-Fi network your phone can hear, with each one's signal strength, channel, band, channel width and security. Its channel graph shows which networks overlap, so you can see whether your router is fighting its neighbours for airtime. Read it to choose a clearer channel, check your coverage and spot old or insecure settings.

What a Wi-Fi analyzer is for

Your router does not broadcast in isolation. In a block of flats or a busy street, your phone may hear dozens of networks. They all share a limited number of channels, and when several sit on the same or overlapping channels, they slow each other down.

An analyzer app makes this visible. It does not change anything on your router. It measures what is in the air so you can make better choices.

The columns explained

Most analyzers list the same details for each network. Here is what each one means.

SSID. The network name you see when you connect.
BSSID. The hardware address of the specific radio sending the network. A mesh system or a router with two bands will show several BSSIDs under one name.
Signal (RSSI). Received strength in dBm. Closer to zero is stronger: −50 dBm is strong, −67 dBm is usually the minimum for smooth video, and −80 dBm is close to unusable.
Band. 2.4 GHz, 5 GHz or 6 GHz. Each has different reach and capacity.
Channel. The specific slot within the band that the network uses.
Channel width. How much of the band the network occupies, such as 20, 40, 80 or 160 MHz. Wider means more speed but more overlap with neighbours.
Wi-Fi standard. Such as Wi-Fi 5, Wi-Fi 6, 6E or 7.
Security. Such as WPA2 or WPA3. An "open" network has no password.

How to read the channel graph

The channel graph is the most useful part of the app. Each network appears as a curved hump. The position of the hump shows its channel, the width shows how many channels it covers, and the height shows how strong it is at your phone.

When reading it:

Find your own network first. It is usually the tallest hump if you are near your router.
Look for humps that overlap yours. Any network whose hump overlaps yours shares airtime with you.
Pay attention to strong neighbours. A tall neighbouring hump on your channel matters much more than a faint one far away.
Look for gaps. A part of the graph with few or only low humps is a quieter place to move to.

On 2.4 GHz, channels overlap heavily. In most regions, only channels 1, 6 and 11 avoid overlapping each other, which is why most networks pick one of those. On 5 GHz there are many more channels and less overlap, though wide channels can still collide.

What a Wi-Fi analyzer can tell you

Whether your channel is crowded. If several strong networks share it, moving may help. See how to find the best Wi-Fi channel.
How strong your signal is in each room. Walk around with the analyzer open and watch your network's reading.
Whether you are on the best band. If your device is on 2.4 GHz near the router, 5 GHz may be faster. 2.4 GHz vs 5 GHz vs 6 GHz explains the trade-offs.
Whether your router supports newer standards. The standard column shows Wi-Fi 6, 6E or 7 support.
Whether old security is still on. WPA or "open" on your own network is worth fixing.

What it cannot tell you

The app measures radio signals. It does not show:

Your internet speed. A strong Wi-Fi signal can still sit on a slow broadband line. Run a speed test for that.
Non-Wi-Fi interference. Microwaves, baby monitors and some Bluetooth devices use the 2.4 GHz band but will not appear as networks.
How busy each network is. A neighbour's network may be strong but idle, or weak but streaming all day.

A quick routine for using one

Stand near your router and note your network's band, channel, width and signal.
Check the graph for overlapping networks on that channel.
Note the suggested quieter channel, if your analyzer offers one.
Walk to the rooms where Wi-Fi feels slow and note the signal there.
Change one thing at a time on your router, then check again.

If you decide to switch, how to change the Wi-Fi channel on your router has the steps.

How CellRadar helps

CellRadar includes a Wi-Fi Analyzer that lists nearby networks, draws a channel graph, shows Wi-Fi 6, 6E and 7 support and suggests a channel to try. Its Wi-Fi Meter gives a live strength gauge as you move, and the Dead-zone Walk Map colours each spot in a room by its measured signal. It tells you what to change; the change itself happens in your router's settings.

Frequently asked questions

Can a Wi-Fi analyzer speed up my Wi-Fi?

Not by itself. It shows you the information you need, such as a crowded channel or a weak room, so you can make a change on your router that may help.

Why do I see my network name more than once?

Your router probably broadcasts on two or three bands, or you have a mesh system. Each radio has its own BSSID, so the same name appears several times.

Why does Android ask for location permission for a Wi-Fi scan?

Android treats nearby Wi-Fi networks as location information, because they can reveal where you are. Apps need location permission to list them.

What signal strength should I aim for?

For video calls and streaming, aim for about −67 dBm or stronger in the rooms you use most. Around −50 dBm is excellent.