RTA Music App Review (iOS, $9.99)

  • Category: Music
  • Publisher: andrew smith
  • Updated: Dec, 14 2008
  • Version: 7.0
  • Size: 8.41 MB

Languages: English

Seller: Andrew Smith

-- Updated for iOS 7
-- Updated calibration for all new iOS devices

Customer Ratings

Current Version:
2 Ratings
All Versions:
119 Ratings


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.

** Not sure about buying this? Try our free RTA Lite! **

*** 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.

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.

Customer Reviews

  • Great, easy app!

    by Treeman5

    Title says it all - works well, easy to use and self-explanatory. This should be on every sound engineer's phone!

  • FOH Engineer

    by Audio Professional

    Great tool for the money. I use this app for quick references during every live show.

  • Great product for audio professionals

    by Msandel

    I calibrated a rig of 6 jbl Vertec 88's and 4 80's per side, driven by Lake. And then compared it with a reading from my DBX rta mic. And I must say I was very surprised. It did pretty good. It does lack response above about 12k and below about 40hz. But with the externel mice coming in February. It will be an awsome thing to have

  • Good app

    by javajoecool

    I've been a professional sound man for 30+ years I've seen a lot of gadgets some work and some don't but if you need good ball park measurements this app is what you need. I've tested it against my DBX RTA, Signal Scope and Mac the Scope on my lap top and it's accurate if you calibrate it properly. It's a good app for spot checking a room before you set your system.

  • Useful, but needs updates/configurability

    by wigum

    Great app! I wish it was updated for newer products(iPad models, iPhone 5, etc.)

  • perfect for what it is

    by Wilburguy

    I am a pro audio engineer and this app has proven very handy for nailing feedback problems on live gigs and frankly has saved my butt a few times helping me quickly rough in a system eq while the band's set has already started.

  • Good, but FFT is better (I guess)

    by Ahavill

    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.

  • Useful, but....

    by Haa tech

    A few months ago this app was updated to compensate for the iPhone's microphone not being able to register the 20Hz - 35Hz range. Since that update (including this last update) the app has way over compensated in that area. I would like to use this app and trust it, but as of now, it's too hard to tell whats accurate when there is constantly a curve upward from 35Hz to 20Hz. It's a better app with the mic's natural roll off. Please fix the compensation or return it to how it used to be. PLEASE!

  • Meh...

    by Smartest1ever

    I liked it more before the last update. Now 30% of the screen is being used for unnecessary toolbars and buttons. The iPhone display isn't exactly large to begin with. Looking into other apps now unfortunately...

  • rta

    by danbabcock

    nice rta...be nicer if there was a pink noise out

  • car audio absolute need

    by smaugthewyrm

    this app combined with the switcheasy 'thumbtack' microphone makes a very, very accurate method of tuning in your car stereo. when results are compared to an expensive audiocontrol RTA, the margin of diff. is negligible. i highly recommend this app. btw, the microphone sold by this company is also excellent, and an even better match then the above mentioned mic.

  • Crashes

    by LNDBA

    The app ran fine after OS4 upgrade, but started crashing after last update of RTA was installed.

  • RTA is an excellent value

    by The Audio Bug

    I am a professional acoustical consultant and make my living with very expensive, very accurate test equipment. While the sound measurement applications currently available for the iPhone are definitely not in the class of Type 1 sound level meters or real-time analyzers, they do indeed offer real value. To compare any of these platforms with a Radio Shack sound level meter is an absolute farce. I've calibrated the Studio Six Digital RTA software against my $1,800.00 Ivie IE-35 Type 1 SLM/RTA and found that, within limitations, they track one another quite well. The main limitation is that of iPhone hardware. While the microphone on the 3G version of the iPhone is quite good, the low frequency response does sag somewhat. Given the overall cost of the iPhone/software package (somewhere between $210.00 and $230.00), performance is quite astounding. I wouldn't use this package to support a court case but it does have excellent application in casual use. The true value is that in addition to being fairly accurate, it's always with me since it's my cell phone as well as a pretty versatile measurement platform. I'm looking forward to the dedicated microphone which is expected to be available in Jan 09. If you want accurate readings, have the unit calibrated against a known standard such as a calibrated professional sound level meter. By the way, Andrew Smith, the author of this product, has long been involved in the design and manufacture of professional audio measurement equipment such as the Audio ToolBox now marketed by Sencore. He knows what it takes to make a good measurement device. Bravo Andrew!

  • surprisingly useful tool

    by SoundsOKtoMe

    Others have already stated the strengths of this application. So I'll just restate how convenient it is to have it with me at all times. You never know when you might be called upon to ring out some stage monitors....

  • The Best 10 Bucks I've Ever Spent!!!!!!!

    by rushfromwayback

    As a professional audio engineer I've used almost every RTA out there. This is a simple 1/3 octave analyzer for taking quick measurments and finding feedback frequencies. Nothing even comes close for the money. I'm using an iTouch (2nd Gen) with a mic from Touchmic.com and can't believe the accuracy once it's calibrated. No it's not a Techron Tef but it's 10 bucks. I haven't used the built in pink noise generator because I have a mic connected to the headphone jack. For those of you who rate this App badly... you don't have a clue what it's practical use is.

  • Suprisingly accurate.

    by MRsound011

    I was hesitant to buy this app, thinking there was no way it could be remotely accurate. But since it was ten bucks, I figured it must be somewhat professional. So, I bought it, played with it a little, and then tested it against my analysis rig. I use smaart v.6 with a sound devices usbpre and an audix tr40a mic. I set up my rig and tested this app against it and was blown away by the results! It's very accurate considering the hardware it uses, and is a great app to have as a pocket rta. It's not as accurate or in-depth as smaart, but it's handy and is less than 1/100th the cost of my setup (not including the computer required to use it.) Overall, a great product. I have since bought studio six's tone gen and polarity check and am pleased with them as well.

  • Good App

    by dBNick

    Nice. But would be even more useful with NC and NR curves as well.

  • RTA

    by Digione

    Great app, works well, real easy to use and easy to calibrate. If you are looking for an inexpensive RTA this has got to be the one.

  • Great deal for ten dollars!

    by phatstuff

    Very handy tool with freq selection. Very handy to spot feedback freqencies for live sound performances.

  • Excelent professional software

    by pablodelrio

    I am a Latin Grammy winner music producer, using the RTA to tune every room where I mix, and I am getting excepcional results. I was not convinced at first, but after listening to my work on the radio, I trust the curves to the "T". Thanks guys for creating this great tool!!!

  • Still Drains Your Battery

    by Gollnick

    Yet Another update and it is clear that the developer feels that this battery-draining background feature is somehow desirable. I have given up. Obviously, they do not read these comments because we have yet another update and the background battery drain remains. They obviously like this "feature." -------- I've been a huge fan of this app for years. I consider it essential for live- sound work. But, recently, they added this "background" mode in which the app keeps running even when you exit it. To stop it, you have to manually kill it... a big and inconvenient extra step. And if you forget to kill it, it will run down your battery. When you're mixing a show, you don't want this extra step. This silly "feature" is a disaster. I have complained and complained and yet this "feature" persists. There are other Real Time Analyzer apps. If you are looking for one, despite how good this app is, I suggest you look elsewhere because of this one overwhelming problem.

  • Doesn't work with iOS 7

    by jdub00769

    When will this work again? It was great with iOS 6 and before. All it does now is freeze when it is opened.

  • This program is so worthless

    by geowizrd

    This program puts on a nice light show but thats about it. After noticing a distinct difference between speach response curves as compared to my Frye Box (A $7000 sound analyzer used for hearing aids and speech mapping) I decided to check the calibration of the program and it's awfull! A 1KHZ Pure Tone shows up as a nearly 4khz and a 250hz tone shows up as 1.5K. There seems to be no way to calibrate the program either. This program is waste of $$$ BEWARE!!!

  • Not worth ten bucks.

    by Ortish

    This does not work as well as I hoped. What a waste of ten bucks. I wishbthere was a lite version of this I could have tried first.

  • App

    by Kj1134

    Great app so far. Does what it's says but I hoped it played music from my iphone and ran this app at the same time for $9.99

  • Problems with iOs4?

    by Drewparkersc

    I've been having crashes ever since I updated my os.

  • If you know what this is, BUY IT!

    by I'm a freakin' App junkie!

    Extremely handy tool for the audio folks, an RTA in your pocket. iPhone is somewhat limiting at a mere 105dB max and noisefloor of 28dB on my phone but for most basic quick tweaks, this will do the job. Of course if you get a real mic, this app is priceless. So Nathan and Luke, stop reading this and buy it already :)

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