A Real Time Analyzer for the iPhone, iPad and iPod Touch. Test your speakers, tune your room, do acoustical analysis work or just have a better understanding of audio frequencies. RTA is a professional-grade acoustical analysis tool. All filters meet or exceed ANSI and IEC Class 1 specifications.

Includes Octave and 1/3 Octave modes, with selectable decay times, as well as Peak Hold and true linear Average mode.

*** iOS Microphones

We have analyzied every iOS device, including all of the iPads, all iPhones, and iPod touches, and have created microphone compensation files that are applied automatically. You can trust the results you are getting, often within just a few dB of a far more expensive analyzer. Calibration is updated regularly, automatically, from our cloud-based calibration database.

Upgrade to our iTestMic or iAudioInterface2 to bring your system up to full professional specs.

*** Save and Recall Graphs

You can save and recall graphs, marked with the GPS location, date & time, and your comment, as well as store the image to your photo roll.

Export the data as an XLS formatted file to your computer for inclusion in reports or further analysis.

*** Max and Min Bars

You can also turn on resettable Max/Min bars (see image #4) to capture peaks. Double-tap to reset the bars.

*** Specifications and Devices

The internal iPhone mic has a noise floor near 30 dB, and if your are running iOS 6, clips around 120 dB.

*** Touch GUI

Fully interactive touch GUI features includes scroll up/down, pinch to zoom or compress the vertical dB scale, or swipe horizontally to get a cursor that reads out the exact dB level and frequency across the screen. To make the cursor disappear, swipe it off the graph to the left.

The landscape-mode display flips 180 degrees so that you can face the internal mic in either direction.

*** Overlay Curves

Also included are optional noise curve overlays, in NCB, RC, PNC, NC, X-Curve and NR mode. See picture #2 for an example. Use this feature to get a quick reading on the noise levels in a room. Also includes the cinema large-room X-curve overlay.

*** Calibration

RTA can be fully calibrated, whether you are using it with the internal iOS microphone, or one of our professional test & measurement mic solutions. And, if you are using iTestMic, the mic calibration is transmitted directly to the app, so you are always calibrated.

*** RTA or FFT?

If you are wondering if you should download this app or our FFT app, check out our website, we have a page devoted to this topic.

See our other acoustics and audio apps, including AudioTools.

What’s New

Version 9.2

-Updated for latest iOS devices
-Bug fixes and stability improvements

Ratings and Reviews

3.9 out of 5
9 Ratings

9 Ratings

Ahavill ,

Good, but FFT is better (I guess)

I was at work (I'm a live sound engineer) and we were discussing speaker phase, when I said "They should make an app so you could test spkrs with iPhone." It didn't take long before I found all the Studio 6 products. I now have SpeakerPop, GEN, SPL, & RTA. They all work wonderfully.
That said, I was a little disappointed to learn about FFT. It's not made too clear in the descriptions, but FFT is basically a more accurate & detailed version of RTA. I wish I'd bought FFT, since I want the most accurate thing availible. However, I'd already purchased RTA, & because of App Store rules, I can't trade it in towards FFT.
If you're going to spend $10 on an app, you are probably going to use it for work like me, so splurge & get the $20 FFT. I am debating it, my main hangup is that I've already spent $10 on the RTA app.

Jake Brew ,


Just saved my bacon. Have a Trane Centravac chiller making a whine noise. This showed it is an 8k whine at the compressor.

Now I have some data to go back to Trane with.

I csn use this im my small audio room in my house now for some frequency readings.

Its worth the dough.

Zmistery ,

Fixed 1/3 octave analyser should be the name

You cannot resolve anything less. And it is centered on 1 khz and not adjustable. Worthless for identifying frequencies and it's harmonics.


Andrew Smith
23.7 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 Curve Files $9.99
  2. STC -- Transmission Loss $9.99


  • Family Sharing

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

More By This Developer