Audio Spectrum Analyzer dB RTA 4+

Sound frequency, decibel meter

Marina Polyanskaya

Designed for iPad

    • 4.5 • 3K Ratings
    • Free
    • Offers In-App Purchases



Full of accurate tools more often found in expensive sound analysis software, Spectrum Analyzer is perfect for amateurs and pros alike.

Spectrum Analyzer is full of fantastic advanced features you won’t find elsewhere easily!

This app offers a fast and accurate spectrum analysis suitable for both amateur hi-fi enthusiasts and professional A/V engineers. This incredibly precise, pro level tool is perfect for tuning your home cinema, car stereo, subwoofers, and more. Spectrum analyser gives insight into your sounds and deconstructs the audio spectrum, showing the levels of the various frequencies in your audio signal.
The built-in sound meter provides high-quality measurement results when measuring ambient noise levels in a multitude of real-life scenarios.

Features include-
● Octave Band Real-Time Analyzer
● FFT Plot - Fast Fourier Transform
● Smooth HD Graphics
● Multispectral Harmonic Analyzer
● Integrated Sound Level Meter (dB-A weighted)

FFT Features
● FFT size from 256 to incredible 16384
● Hold Max and (unique feature) Min peaks
● Linear and Logarithm scales
● Various window functions: Rectangle, Hanning, Hamming, Tukey, Cosine, Lanczos, Blackman
● Max frequency live tracking
● Selected frequency live tracking
● Fullscreen mode

Octave RTA features
● Bars and unique spline plot modes
● Full, 1/3, 1/6 octave modes
● Hold max mode
● Selected bar tracking.

And much more...

Please feel free to contact us with any questions, problems or ideas via e-mail

Privacy Policy -
Terms of Use

What’s New

Version 2.2.1

- Minor bugfixes.

Please be sure to rate this new version on the App Store and leave a review.
Your feedback is greatly appreciated and helps me continue updating Spectrum Analyzer.

Ratings and Reviews

4.5 out of 5
3K Ratings

3K Ratings

Killertone ,

Clean Design... but wanted Line In option

It gets four stars because IF you only wanted to use the not so great built-in microphone of your device then it seems to work very well. I was actually willing to pay for a way to unlock a Line-In feature but nothing told me that the feature exists. The fact that the spectrum plot can hold the peaks is a real nice and makes your app more useful. The pop up is super annoying, but being an App developer myself...I understand how selfish people just expect a great feature rich App to be all for FREE (i gave up thinking i could be paid for all my hard work). Just for fun, you can check out my Free iPhone App FlipNshare ProVideo. I did uninstall the app only because i need Line-In feature, please let me know if it’s actually available.

jimlistens ,

Great App to Analyze a Strange Noise in Home

We had encountered a buzzing noise that came and went. The noise was coming from the ceiling my office like it was originating in attic. Was it a bee hive or hornet infestation, wind causing vibrations in eves or loose roof components or more serious issue some kind of electrical hum or buzz. I thought if only I had a spectrum analyzer I could rule out an electrical issue if the noise was 60 HZ or a 120 Hz harmonic. So I thought my phone has a microphone and it certainly could analyze sound . So I found this App for my iphone.
It showed the primary vibration was 101 HZ so I felt relieved. But what was it? The room next door was a bathroom and the noise was louder but still coming from the ceiling. So then I thought toilets can cause funny noises. I took off the tank lid and waited until the noise was loudest and touched the float arm hitch was connected to the auto shutoff valve . It was vibrating like crazy and the noise went away . But I still could not understand why the noise was coming from above. Then I thought the plumbing stack vent was just like a pipe in a pipe organ. The vibration in the tank made the column of air in the stack vent resonate.
Strangest annoying sound and plumbing issue I have ever heard of in my life. I fixed it by turning the float adjustment screw just a bit.
The technology in a smart phone seems to be unlimited.

Hypops ,

Excellent for quick and dirty measurements

This app has been an excellent everyday supplement to my more involved measurement mic and software DSP. Also works great as a basic SPL meter to set approximate volume levels. Whenever I don’t need to or feel like setting up my full measurement rig, this app will let me know if my system and my room are behaving as they should be. With so many unreliable, ad-driven, and overpriced audio measurement apps in circulation, this one is a pleasant surprise.

App Privacy

The developer, Marina Polyanskaya, 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 Linked to You

The following data may be collected but it is not linked to your identity:

  • Purchases
  • Location
  • User Content
  • Identifiers
  • Usage Data
  • Diagnostics

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

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