Optional · about one minute

Cross-check your phone

1Open the Noise app on an Apple Watch, or the Earwitness app on a second iPhone
2Put both side by side, a hand's width apart, pointing the same way
3Play some music or run a tap for one minute, then type in the watch's number

Live comparison · 0:48 of 1:00

This phone61 dB
Apple Watch59 dB
Difference2 dB

Average level over the minute. Anything within 3 dB passes.

Cross-checked

Your readings will carry this grade from today.

What this does and doesn't do

  • It catches a phone that reads badly wrong (a blocked or damaged microphone)
  • It is not a calibration: your levels stay a guide, within about 5 dB
  • For levels a council can rely on, use a calibrated mic or a hired meter
Save cross-check