SmaartTools for iOS single channel RTA is a full-featured audio spectrum analyzer based on the single-channel portion of Smaart 7 by Rational Acoustics.

If you need a two-channel FFT for your iOS device, check out Transfer Function, a module in our AudioTools app.

Smaart Tools was developed by Studio Six Digital in collaboration with Rational Acoustics and is based on the proprietary algorithms, techniques, features & color mapping found in the Smaart® v.7 acoustic test and measurement software.

Now, you can have the sophisticated analysis of Smaart® on the iPhone and iPod touch mobile platform.

The single-channel module includes the following features from Smaart® v.7: the RTA Bar graph, RTA Line graph, RTA Bar & FFT graph, and the Spectrograph. On the iPhone and iPod touch, there is an additional graph, the Spectrograph with the RTA Line graph on top of it.

All of the RTA banding options available in Smaart® v.7 are available, including log, lin, Octave, 1/3rd, 1/6th, 1/12th, 1/24th and 1/48th Octave modes.

The decay modes from Smaart® v.7 are also available, and include None, 1, 2, 4, 8, and 16 averages, and the Smaart 1-10 second custom decay settings, as well as Infinite, Fast, and Slow.

The frequency scale can be zoomed down to a single octave, and the dB scale can be zoomed down to 1dB resolution. Double-tap the screen to return to full frequency response, and to auto-scale the dB scale.

Real-time Spectrograph history is saved, just swipe to see sound events that have scrolled off the screen.

Other features include high-contrast mode, variable Spectrograph speed, vertical or horizontal running Spectrograph, Difference mode, Peak Tracking, and FFT Windowing.

All of the standard AudioTools features, such as Save / Recall and the Generator Panel are available. All settings are automatically saved and restored the next time that you run the app.

On iPad and larger iPhones, split graph mode is available, so that you can put any two graphs on the screen at the same time. Check out the screenshots to see if your device supports them.

Smaart Tools RTA Spectrum works great with the built-in iOS device microphone, as we have proprietary microphone compensation and calibration database derived for every iOS device. To upgrade to full professional results, use our iTestMic, or iAudioInterface2 with any test & measurement microphone.

Also see our other great audio test and measurement apps.

What's New

Version 4.7

-Added support for latest iOS versions and devices
-Bug fixes and stability improvements

Ratings and Reviews

Rip off!


Accidentally purchased this by an apparent fly-by-night app developer. I had purchased another app to analyze room acoustics from same developer and mistakenly purchased this. $50 for an app that cannot utilize an external interface!!! SMAART on the apple mic?!? What?!?

When I attempted to get a refund, I was blocked. Studio six's web site will not load a web page. I could not even google cache it to find contact info!!

This company has zero customer service, is a ghost. I highly recommend staying away from any of their software. Zero accountability, zero support, all profit for them. Total waste of money and I feel conned!!

Developer Response

I think you have your external interface working now, but if not, please contact us by our support page on --Andrew

Excellent to have if you don't have your computer with you.

Ryan Sedillo

They did a great job recreating the look and feel of Smaart on the computer and configuring it for the iOS platform without dimming anything down. Very easy to navigate and it can pretty much do everything it's computer counterpart can do. Works very well no complaints or concerns so far.

Paying the same thing twice


SMAART is a great app! I use it daily! Also, the apps in AudioTools are very useful for people who deal with sound!


Andrew Smith
29.5 MB
Requires iOS 9.0 or later. Compatible with iPhone, iPad, and iPod touch.
English, French, German, Japanese, Polish, Simplified Chinese, Swedish
Age Rating
Rated 4+
© Andrew Smith
In-App Purchases
  1. Reference Curves Option $14.99


  • Family Sharing

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

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