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RTA Lite

By Andrew Smith

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Real Time Analyzer for iPhone.

Now you can have an accurate and powerful Real Time Analyzer (RTA) for free on your iPhone or iPod touch.

This is the free ad-supported version of our popular and highly rated Studio Six Digital RTA app. It includes octave and 1/3 octave modes and iPhone mic compensation.

Using ANSI type 1 or better filters, this RTA is very accurate, even in this lite version, since it uses the engine from our full version. Use it to check your sound system, monitor audio, and adjust your car audio system.

Try this out, and if you like it you can always upgrade to our full RTA version, or to AudioTools, which includes the full RTA and a lot more.

Check out iAudioInterface, our professional-audio test and measurement microphone, line input, and line output accessory made for iPod touch.

New! iTestMic is a direct plug-in test & measurement mic that has full pro specs.

The full version of RTA, and the version in AudioTools, is ad-free and adds Pink Noise generation, graph zooming, dB/frequency cursor, Max/Min bars, noise curve overlays, Save and Recall of graphs, external mic support, overall SPL A&C dB readout, and decay options including slower decay, and peak hold and average modes, and lots more.

*** iPhone mic Frequency Compensation Filter

RTA uses a special frequency-compensation filter to flatten the iPhone mic.

RTA is designed by the same team that built the Audio Toolbox acoustic analyzer.

*** Specifications and Devices

The internal iPhone mic has a noise floor near 30 dB, and clips around 105 dB. So, be aware that this tool will NOT work in very loud environments, such as clubs or some concerts.

What's New in Version 2.2

— Now supports iOS 8. Fixes audio issues on iPad 2, iPad 3, iPad 4, and iPad mini.
— Now supports iPhone 6 and iPhone 6 Plus displays.
— Bug fixes and stability improvements.

iPhone Screenshots

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Customer Reviews


Try the RTA Audio app. It's free and useable. Rookie_Dawg, what? I doubt people using a phone are doing serious spectral analysis. Personally, I cheat and use my phone when i've got some pesky feedback in the stage monitors that I cant find (usually when i'm working alone and running monitors from FOH). I dont need anything fancy. I understand free apps have limits, but if dont put out a free version that doesnt work at all. That's just dumb.

I paid for this and now...

They broke it with the update. I wish I could just see above 70db. What a joke. Not worth free let alone the rip off of the in app purchase, that got robbed with the update. I would go as far as to say support some other company. This one in not concerned with its customers.

Broken by update

This used to be my go-to RTA app, but the recent update has rendered it completely useless. It needs to go above 80dB!! I should never have updated.

RTA Lite
View in iTunes
  • Free
  • Category: Music
  • Updated:
  • Version: 2.2
  • Size: 1.4 MB
  • Language: English
  • Seller:

Compatibility: Requires iOS 5.1.1 or later. Compatible with iPhone, iPad, and iPod touch.

Customer Ratings

We have not received enough ratings to display an average for the current version of this application.
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Top In-App Purchases

  1. RTA Lite ad-free$0.99