Its a cool App!

This here is a nice wee App that most of you "sound freaks" will enjoy. Frequency is easy and simple to use; just point your iPhone mic towards the noise source and Frequency will display the waveform and the frequency in Hz on your iPhones display.
Im heavily involved with the music scene and I find that this App is quite accurate in showing me the frequency of a certain instrument when mixing live audio. I actually put it to a test against a signal generator and the result was ok. Usually it was off just 1 to 3 Hz in low to mid range but after going past 2kHz it couldnt keep up. Going past 2.35kHz is where Frequency lost it.
In conclution, the signal range in which Frequency can operate is pretty narrow but in any case its a cool App that Ill be carrying in my pocket.

Riff_Master about Frequency Counter Pro, v1.0