jimmys69
MOODerator
There is no way to verify those apps will be accurate without a calibration file for the phone's mic. Even for SPL measuring. Being most cell phone mics suck, I would put very little stock in these apps. Dayton audio makes a measurement mic specifically for cell phone measuring apps.
Dayton Audio iMM-6 Calibrated Measurement Microphone for Tablets iPhone iPad and Android
I have this mic and speaking from experience, even with this mic the mic pre in most cell phones are too easily overdriven and will not give accurate spl measurements though it can give decently accurate measurements of freq response.
I ordered one myself. Just out of curiosity. Thanks for the link Jam!
Are you using the recommended 'Audio Tool' for android? Or are you an Iphone user?