iPhone What is the best app for measuring sound level in dB?

[hajime]

Hi, I tried a few but they gave very different values. Which app is the most accurate one to use? Ideally free also.

 

[0128672]

I like decibel meter: https://apps.apple.com/us/app/decibel-meter-sound-detector/id1254994873

 

[lexvo]

I have SPLnFFT. Not free, but it came up as one of the best in a scientific test:

(PDF) Testing the accuracy of smartphones and sound level meter applications for measuring environmental noise

PDF | On May 1, 2016, Enda Murphy and others published Testing the accuracy of smartphones and sound level meter applications for measuring environmental noise | Find, read and cite all the research you need on ResearchGate

www.researchgate.net