***** "As a former IEEE Technical Committee Chair for Signal Processing, I find this app amazingly flexible and useful. Works very well with its proper designed-in control selections." - Roblake

Spectrum Analyzer for iOS 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:
● Octave Band Real Time Analyzer
● FFT Plot (Fast Fourier Transform)
● Spectrograph module
● Test Tone and White/Pink Noise Generator
● Native iPhone 6 graphics

>>> Check out the demo videos at

Audio input may be acquired via the built-in microphone or an external measurement microphone. For best results we recommend using a calibrated measurement microphone connected via USB audio interface or iPhone dock connector. This allows for high precision and flat frequency response, as well as for stereo input.

Audio credits:
"Basement Floor" and "Enchanted Journey" by Kevin MacLeod
"Evening Birdsong" and "Cuckoo" by Benboncan

What's New

Version 1.9.1

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

● 64-bit
● Mic calibration
● Minor fixes

Ratings and Reviews

3.9 out of 5

35 Ratings

35 Ratings

Excellent app

This app works great and have a very pleasing look and feel. I design sound systems and this app is useful to get a visual on how my system is performing. This app is also going to be useful for training or testing employees. The app does what it's supposed to and if you get a good external mic it becomes a lot more precise. This tool is well worth the money and I really couldn't be more pleased with this purchase.

I was surprised how far to push my car stereo settings--nice!

Don A7

Seems to work best if I attach the iPhone to the car via USB for pink noise generator, and use iPad for spectrum analysis. Doing both on the iPhone alone, the iPhone noticeably diminished the pink noise volume. I used iPhone 7+ and iPad Pro with iOS 10.3.2, and the screen is completely steady. Even with the iPhone 4S, the screen is completely steady.


David Heaukulani

I use this app for on the spot analysis of stringed instruments I construct and repair as well as checking out those I might purchase at retail. I find the octave RTA suits my purposes best. And you can't beat the price. Does the same thing as versions costing $75 or more.


11.5 MB
Requires iOS 7.0 or later. Compatible with iPhone, iPad, and iPod touch.
Age Rating
Rated 4+
© 2015 ONYX Apps


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

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