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Free on iPhone & Android

Cell Surveys: Signal Heatmap

See where your cell signal is strong and where it drops. The app records signal as you go, maps it as a live heatmap, and keeps every survey so you can replay it or export it.

Download on the App StoreGet it on Google Play

No ads. Optional Cell Surveys Pro for parcels and mileage.

Cell Surveys Android app showing live readings over a coverage heatmap

What the App Does

A map of your own signal, the crowd's coverage map, and the tools to survey a place properly.

  • Signal heatmap

    Every reading lands on the map as a colored square, green where signal is strong and red where it is weak, so dead spots show up as you walk or drive. Android records measured RSRP, RSRQ, and SINR; on iPhone the level is estimated.

  • Coverage map

    A crowd-sourced coverage map, rebuilt every day from the last 30 days of readings, shows average signal and the most common carrier in squares about 110 meters across. Fleets let a group pool their heatmaps privately.

  • Surveys and archives

    Start a survey of cellular, WiFi, Bluetooth, magnetic field, and barometric pressure whenever you like. Every survey is kept in an archive you can filter, replay point by point, and export as CSV, or as a ZIP on Android.

  • Mileage and trips

    Pro

    Drives are logged on their own. A calendar shows miles per day, each trip has a route map colored by signal, and you can mark trips Work, export a CSV, and get weekly and monthly summaries.

  • Parcel dashboard

    Pro

    Stand on a property and the app locks to its parcel, from county records covering most of the U.S. The dashboard maps signal on a 2D grid of 5-meter squares, and a 3D view stacks readings by floor or altitude.

  • Cell Surveys Pro

    Heatmaps, the coverage map, and survey recording are free. Pro adds parcels, the Parcel dashboard, operator tools, and mileage and trips, for $4.99 a month or $39.99 a year.

    What Pro includes

See It in Action

Android

Cell Surveys Android app locked to an arena's parcel, with live cellular, magnetic, elevation, and pressure readings over a coverage heatmap

Live readings and coverage heatmap

iPhone

Cell Surveys iPhone app sensor picker with Cellular, WiFi, and Magnetic selected, plus Bluetooth and Barometric options

Choose what to survey

Android and iPhone

iOS does not let apps read cell-level measurements, so the two apps differ on cellular data. For PCI, cell ID, or measured signal quality, use Android.

Features on Android and iPhone
FeatureAndroidiPhone
Carrier and network typeYesYes
Cellular signal levelMeasured RSRP, RSRQ, SINREstimated
PCI, cell ID, and neighbor cellsYesNo
Two carriers at once (dual SIM)YesNo
WiFiEvery visible networkConnected network
Bluetooth LE, magnetic field, barometerYesYes
Coverage heatmap and parcel lockYesYes
Archives and survey replayYesYes
ExportCSV or ZIPCSV
AI chat with your own API keyCan read your surveyGeneral chat

Planning a small cell or verifying one? See small cell baselines with the app.

Optional subscription

Cell Surveys Pro

Parcels and operator tools, the Parcel dashboard in 2D and 3D, and mileage and trips with a calendar, Work and Personal trips, CSV export, and weekly and monthly summaries.

$4.99 a month or $39.99 a year, with a 7-day free trial for new subscribers. One subscription covers your account on iPhone and Android.

See what Pro includes

Your Data

An account is required: sign in with Google, with Apple, or with an email address. By default the app records in the background and uploads your readings to Cell Surveys, where they are used in aggregated, anonymized form for coverage maps. Withdrawing data collection consent in Settings stops background recording and all uploads. There are no ads, we do not sell personal information, and you can delete your account and its data at any time.

Privacy PolicyDelete your account

Frequently Asked Questions

Is Cell Surveys free?
Yes. The app is free to download and has no ads. Signal heatmaps, the coverage map, and survey recording are free. Cell Surveys Pro is an optional subscription ($4.99 a month or $39.99 a year, with a 7-day free trial for new subscribers) that adds parcels, the Parcel dashboard, operator tools, and mileage and trips.
Does it work on iPhone and Android?
Both. iOS does not let apps read cell-level measurements, so the iPhone app records the carrier and network type and estimates the signal level, while the Android app records measured RSRP, RSRQ, and SINR, plus the PCI, cell ID, and neighbor cells.
What does the signal heatmap show?
Colored squares wherever you have been, from strong signal in green to weak signal in red. Your own heatmap builds as you move, and the crowd-sourced coverage map shows average signal from everyone's readings over the last 30 days.
Does the app record in the background?
Yes, if you allow location access all the time. It then records as you go about your day and logs your drives. You can turn data collection off in the app's Settings at any time, which stops background recording and uploads; a survey you start yourself still records to your phone.
What happens to my data?
Your readings are uploaded to your Cell Surveys account to build your maps, trips, and mileage, and are used in aggregated, anonymized form for the coverage map. There are no ads, we do not sell personal information, and you can delete your account and its data at any time.
Can I export my readings?
Yes. Any survey can be exported as CSV, or as a ZIP of the session on Android, and Pro mileage has its own CSV export. Google Drive backup is optional.

More answers on the support page.

Download Cell Surveys

Free on the App Store and Google Play. No ads.
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