As far as I can tell it works great

I have downloaded several and this one seems to have the photo capture feature which is nice, but dont have any alternate equipment to compare its accuracy. Im curious that is seems some readings, on all the phone apps, measure a narrow band range of volume. Some quiet settings seem to be in the 65 range and some extremely loud one in the 90s. But again I have no non-phone bases equipment to compare.

Rev UMC about Decibel X:dB Sound Level Meter