What's the best cell phone app to test how loud my stereo is?

I was able to borrow a decibel meter from my high school physics teacher, got 108 dB in the cab of my old car with 2 kickers in a prefab box on 600W RMS and 117 at the port. Disappointing. Maybe look into your local high school?

 
None. Especially with the internal mics.

I use the AudioTools app and the Dayton iMM-6 mic, it's awesome and has a lot of functionality, but it's only good up to about 127dB, so SPL testing isn't in it's realm. And this is the best you're going to get

As has been said, buy a real meter if you want anything close to accurate results.

 
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