FFT Plot 4+

Sound Frequency Analyzer RTA


    • $9.99



***** "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

4.8 out of 5
83 Ratings

83 Ratings

luckyjayguy ,

I really like this app!

I used it to diagnose a whistle sound in an air handling unit. It works quite well and I have told several other people about it. I use an iPhone 5 and when you take a screen shot and upload it to your computer, it looks very professional.

The other features are very nice, too. My only suggestion is to allow zooming in on the Hertz scale.

Mister_Coke ,


I use this app when I'm performing the final tuning in car audio systems and I'm impressed with the response and resolution it has. It could be better if it supported external microphones such as ZOOM's XY and omni capsules but performs pretty reliably through the iPhone's internal microphone. And fairly accurate up against my ARC software in my recording studio studio. Well worth the money if you need a good FFT

scubnubbic ,

Very nice FFT

The nicest thing about this analyzer is that it has the ability to recognize the particular microphone you have plugged in to your iPhone. I use a Shure MV88 stereo mic. That means that the application is calibrated for my particular microphone! I was able to quickly equalize my sound system and it sounds much better now.

App Privacy

The developer, ONYX Apps, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy.

Data Not Collected

The developer does not collect any data from this app.

Privacy practices may vary, for example, based on the features you use or your age. Learn More


  • Family Sharing

    Up to six family members can use this app with Family Sharing enabled.

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