Opening the iTunes Store.If iTunes doesn't open, click the iTunes application icon in your Dock or on your Windows desktop.Progress Indicator
Opening the iBooks Store.If iBooks doesn't open, click the iBooks app in your Dock.Progress Indicator

iTunes is the world's easiest way to organize and add to your digital media collection.

We are unable to find iTunes on your computer. To buy and download FreqCounter by Junfei Peng, get iTunes now.

Already have iTunes? Click I Have iTunes to open it now.

I Have iTunes Free Download


By Junfei Peng

This app is only available on the App Store for iOS devices.


FreqCounter is a professional digital Sound Wave Analyzer application, multifunctional and handy.
It can be used to display the real-time waveform of sounds, to analyze audio signal with its frequencies and power levels.
You can move, zoom in and out by gestures to get more signal details.
With mighty FFT spectrum analysis function, you can find out the top 5 frequencies in any frequency range you care about.
FreqCounter is an excellent noise detector, helps you to find the source of noise which might bother you. It is also an outstanding education tool of acoustics.

Feature Highlights:
・Capture Sample Rate: 16bit, 48kHz
・Measurable Signal Bandwidth: 20 ~ 20,000 Hz
・Real-time Waveform Display: 4096 Samples/frame
・Input VU Power Level Digital Display: -160 ~ 0 dB
・Precise Time and Frequency Scale: ms, us, Hz
・Gestures: Tap to pause. Move the waveform with single finger slide and zoom it with double fingers slide.
・FFT analysis: Analyze frequency spectrum in real-time. Show the top 5 frequencies in the current frequency range displayed.

What's New in Version 1.4

Support 64bits iOS devices

iPhone Screenshots

iPhone Screenshot 1
iPhone Screenshot 2

Customer Reviews

Doesn't hold a stable frequency on iPhone 7 plus

Frequency bounces around. I had been using Feedback Detector on my old phone but it's not longer available it worked great. This one doesn't. Ugh.

View in iTunes
  • $1.99
  • Category: Utilities
  • Updated:
  • Version: 1.4
  • Size: 0.5 MB
  • Languages: English, Japanese, Simplified Chinese
  • Seller:

Compatibility: Requires iOS 6.0 or later. Compatible with iPhone, iPad, and iPod touch.

Customer Ratings

This application hasn’t received enough ratings to display a summary.
All Versions: