RTA11.11 - App Store

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.

Version History -Fixed missing devices and calibration causing low SPL readings 11.11 Sep 14 -Bug fixes and stability improvements
-Support for latest iOS versions 11.10 Sep 11 -Increased GPS coordinate resolution in output TXT files to 6 decimal places
-Fixed GPS location not being saved with measurements
-Fixed a crash when adding a photo from the Save screen
-Bug fixes and stability improvements 11.9 Aug 11 -Bug fixes and stability improvements 11.8 12/22/2025 -Updated for new iOS devices
-Bug fixes and stability improvements 11.7 11/24/2025 -Updated for latest iOS devices and calibrations
-Bug fixes and operational improvements 11.6 11/22/2024 -Updated with latest iOS devices and calibrations 11.5 10/17/2024 -Updated with latest devices and bug fixes
-Fixed audio startup issues at app start 11.4 07/09/2024 -Updated for latest iOS devices and new iOS versions
-Bug fixes and stability improvements 11.3 10/19/2023 -Bug fixes and stability improvements
-Support for latest iOS versions and devices 11.2 06/10/2023 -Bug fixes and improvements
-Support for more iOS devices and iOS versions 11.1 07/19/2022 -Bug fixes and stability improvements
-Updated for latest iOS and devices 11.0 09/24/2021 -Added support for Bluetooth speakers
-Bug fixes and stability improvements 10.5 04/14/2021 -Bug fixes and stability improvements
-Added user registration feature 10.4 04/02/2021 -Bug fixes and stability improvements
-Now automatically loads iTestMic2 calibration files 10.3 02/24/2021 -Bug fixes and improvements 10.2 02/03/2021 -Bug fixes and improvements
-Fixed Generator not working correctly 10.1 09/02/2020 -Bug fixes and stability improvements
-Support for direct data file access in Files app
-Support for latest devices and iOS versions 10.0 08/20/2020 -Fixes crash on launch in iOS 9/10 9.6 10/14/2019 -Updated for iOS 13
-Bug fixes and compatibility improvements 9.5 10/09/2019 -Fixed orientation issues in iOS 13
-Bug fixes and stability improvements 9.4 09/28/2019 -Updated for iOS 13
-Fixed issue with setup menu
-Bug fixes and stability improvements 9.3 08/12/2019 -Updated for latest iOS devices
-Bug fixes and stability improvements 9.2 04/08/2019 -Updated for latest iOS and new devices
-Bug fixes and stability improvements 9.1 09/04/2018 -Upgraded for latest iOS and iOS devices
-Now supports iPhone X and other screens
-Bug fixes and stability improvements 9.0 03/03/2018