Field Strength Notice

Please read this before using Field Strength. You'll need to accept it to continue.

Watch where you walk

Surveys are done while walking with your phone held up. Look where you're going, not at the screen, especially near stairs, pets, furniture and other people. Stop walking before you read results.

Only test networks you're allowed to

Field Strength measures the network your device is connected to: it pings your router, runs speed tests and makes test DNS lookups. Use it only on networks you own or have permission to test. Some workplaces and public networks don't allow testing.

Measurements are estimates

Results depend on your device, its position, other traffic and interference at the moment you measured, and can be wrong or incomplete. Field Strength helps you understand and improve your Wi-Fi; it isn't a certified engineering survey and doesn't guarantee any level of service. Blank areas on a map weren't measured.

Speed tests use data

Speed tests against a Mac on your network stay on your network. Speed tests over the internet use your internet data, which may count toward a data cap. You can turn automatic speed tests off in Settings.

Scans of your home are yours

Floor-plan scans, photos and measurements stay on your device (and your iCloud, if you use it). They're shared only when you export or send them yourself. Exports leave out your location, but a floor plan and photos can still reveal where you live, so share them with care.