***** "I use this app to detect sound feedback problems on live show and it became helpful and practic."

FFT Plot is a powerful real-time audio analysis app. Designed with musicians and recording engineers in mind, it can also be used by anyone interested in the world of sound. Ideal for room tuning or speaker tuning, the app enables portable, precision audio measurement and visualization.

Feature Highlights:
● FFT Size (2048 to 16384 points)
● Fast, Slow and Infinite Averaging
● Window function (Hamming, Hann, Rect)
● Peak Frequency detection
● Linear and Logarithmic scale
● Toggle between Flat, A and C weighting
● Pan to adjust visible dB range
● Draggable cursors
● iPhone X ready

Audio credits: "Evening Birdsong" and "Cuckoo" by Benboncan

What’s New

Version 1.2.5

Thank you for helping us improve FFT Plot app! Please rate it on the App Store now, so we can make it even better!

● Toggle between Flat, A and C weighted modes

Ratings and Reviews

4.5 out of 5
13 Ratings

13 Ratings

MykelQ ,

Works well

Seem to do what it says it will. The ability to save screen shots would be handy though.

Sir Alex ,

The best.

I’ve used this app extensively in setting Hi-Fi systems up.
Definitely the best spectrum analyser that I’ve used. Quick simple, effective. Detect room nodes in an instant with the speed of tracking achieved. The infinite setting is a handy tool too, for a whole tracks to gauge overall levels. Overall my go to app for rapid, easy analysis. It would be nice to have the option to change colours for background and waveform.

Randomlkjlkj ,


Used to work fine, but using it for the first time since upgrading to iOS 9 I find that the display flickers dreadfully. The graph is there, but the whole display flickers. However it stops if anything else is displayed such as a notification, or even the little box that comes up when you press star to rate it! But as soon as those a gone the flicker comes back. Help!


7.1 MB

Requires iOS 11.0 or later. Compatible with iPhone, iPad and iPod touch.

Age Rating
Rated 4+
© 2018 ONYX Apps


  • Family Sharing

    Up to six family members will be able to use this app with Family Sharing enabled.

More By This Developer

You May Also Like