decibel measuring iPhone apps

I was curious how loud my apartment is. I live on a busy street. I waited until there was little to no traffic noise to do the test. I tried two iPhone apps.

 

Category Expected result The free Decibel Meter app The 99 cent DbVolume Meter
Inside my apartment 35-45 55-60 44-46
On my terrace (mild honking) 50-60 75-80 50-60
My normal speaking voice back inside 50-60 75-85 50-55
My voice when projecting back inside (like giving a speech or on the phone) 60-70 90-100 57-60

Guess the free one is free for a reason. It’s highly inaccurate! All in all, an interesting experiment.

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