# RTA — Real Time Analyzer

> Professional real-time audio spectrum analyzer for acoustical analysis and sound testing. (iPhone/iPad app by Andrew Smith.)

- Source: https://appshunter.io/ios/app/rta/id298839433 (this page in markdown: same URL + `.md`)
- Developer: [Andrew Smith](https://appshunter.io/developer/291822462)
- Category: Music, Utilities
- Price: $4.99 with in-app purchases
- Rating: 4.00/5 from 25 App Store ratings · 116 written reviews indexed
- Age rating: 4+
- Requires: iOS 15.0 · 29 MB
- Languages: German (Germany), Swedish, European Spanish, American English, Japanese, Chinese (Simplified, China), Chinese (Traditional, Taiwan), Polish, French (France)
- Released: 2008-12-14
- Data updated: 2026-08-29
- Monetization: free with in-app purchases
- User reviews in markdown: https://appshunter.io/ios/app/rta/id298839433/reviews.md

## What is RTA?

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.

## Key features

- Real-time acoustical analysis
- Octave and 1/3 Octave modes
- Peak Hold and Average modes
- Automatic microphone compensation
- Save, recall, and export graphs
- Interactive touch GUI
- Noise curve overlays

## Pricing and in-app purchases

Base price: $4.99.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| STC -- Transmission Loss | $9.99 | one-time |
| Reference Curve Files | $9.99 | one-time |


## Recent user reviews (10 of 116)

All indexed reviews: https://appshunter.io/ios/app/rta/id298839433/reviews.md

### 5/5 — 我购买了参考曲线

*2026-08-09*

我看很多视频介绍里面是有附送一些目标曲线的来 怎么现在都是空的呀？

### 5/5 — What a huge help this app is

*2025-04-21, version 11.6*

Used with iPad mini. Ran pink noise to do the best I could to flatten the sound. What a difference this made! I can see areas that need improvement but I need DSP. For now this works! Thank you

### 1/5 — Actualizar la app¡¡¡¡

*2024-10-16, version 11.4*

Mi iPad se actualizó sola a iOS 18 y ya no funciona la App

### 3/5 — Super App aber

*2024-09-19*

Seit IOS 18 funktioniert sie nicht mehr 
Bitte mehr Support

### 3/5 — Does not work on MQDY2LL/A iPad Pro with iTestMic 2

*2024-06-06, version 11.3*

The app keeps saying “Accessory found iTestMic 2” then “Accessory removed iTestMic 2” and repeats until the mic is removed from my iPad Pro. Sometimes it just crashes or freezes on my iPhone 12. Both have latest IOS.

### 5/5 — Great tool

*2024-01-07, version 11.3*

A great app for the price. Very good comparison when using the inbuilt iPhone microphone to a dedicated RTA mic. 
Easy to read screen and easy user functions.

### 5/5 — Works!

*2023-11-14, version 11.3*

Simple to use and it provides all the info that I need.  Works fine on my iPhone 15 Pro.

### 1/5 — Error !!!

*2023-10-31, version 11.3*

Ya no guarda la lectura del análisis en el carrete de las fotos desde que cambié a iOS 17

### 1/5 — No longer works on older iPad

*2023-10-22, version 11.3*

This has always run beautifully on my older iPad and iOS 12, but this update has made it stop working. All the settings and controls are functional but it only gathers one sample and displays it on the screen and freezes, the play pause button has no effect. I really hope this can be fixed and will continue to work on the older iPads as this has always been a great app to make very good use of those.

### 4/5 — Νομίζω πως είναι αρκετά κοντά

*2023-06-18, version 11.2*

Έκανα έναν ήχοβολισμο σήμερα στο ηχοσύστημα του αυτοκινήτου νομίζω πως είναι αρκετά κοντά με ενα πραγματικό Rta

## Frequently asked questions about RTA

### What does the RTA app do?

This app functions as a professional-grade real-time analyzer for acoustical analysis. It allows you to test speakers, tune rooms, and gain a better understanding of audio frequencies. The filters meet or exceed ANSI and IEC Class 1 specifications.

### What are the key features of the RTA app?

Key features include Octave and 1/3 Octave modes with selectable decay times, Peak Hold and true linear Average modes, automatic microphone compensation for iOS devices, and the ability to save, recall, and export graphs. It also has an interactive touch GUI and optional noise curve overlays.

### How much does the RTA app cost?

The app is free to download and use with its core functionalities. Additional professional features and capabilities may be available through in-app purchases, allowing users to upgrade for enhanced performance and accuracy.

### What devices is the RTA app compatible with?

The app is designed for the iPhone, iPad, and iPod Touch. It analyzes and compensates for the internal microphones of various iOS devices, ensuring reliable results. For professional-grade accuracy, it can also be used with external professional test and measurement microphones.

### What are common use cases for the RTA app?

Common use cases include tuning home theater systems, analyzing the acoustics of recording studios or listening rooms, testing speaker performance, and performing general acoustical analysis work. It's also useful for quickly assessing noise levels in different environments.

## Version history (last 5 releases)

### 11.9 — 2026-08-11

-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

### 11.8 — 2025-12-22

-Bug fixes and stability improvements

### 11.7 — 2025-11-24

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

### 11.6 — 2024-11-22

-Updated for latest iOS devices and calibrations
-Bug fixes and operational improvements

### 11.5 — 2024-10-17

-Updated with latest iOS devices and calibrations

## Apps similar to RTA

| App | Rating | Price | Category |
| --- | --- | --- | --- |
| [Decibel meter for personal use](https://appshunter.io/ios/app/decibel-meter-for-personal-use/id6448749318) | 4.5 (28) | Free | Music |
| [AudioTools, dB, Sound & Audio](https://appshunter.io/ios/app/audiotools-db-sound-and-audio/id325307477) | 4.8 (5,060) | $19.99 | Music |
| [Audio Spectrum Analyzer dB RTA](https://appshunter.io/ios/app/audio-spectrum-analyzer-db-rta/id1281873790) | 4.5 (3,042) | Free | Music |
| [Sound Decibel Meter-NIOSH,OSHA](https://appshunter.io/ios/app/sound-decibel-meter-nioshosha/id1571075296) | 4.5 (335) | Free | Music |
| [Spectrum Analyzer: Spectrogram](https://appshunter.io/ios/app/spectrum-analyzer-spectrogram/id981810895) | 4.2 (195) | Free | Music |
| [Audio Spectrum Analyzer Pro](https://appshunter.io/ios/app/audio-spectrum-analyzer-pro/id1152352806) | 4.4 (238) | Free | Music |

## More apps by Andrew Smith

- [Speaker Polarity](https://appshunter.io/ios/app/speaker-polarity/id293263027)
- [SPL](https://appshunter.io/ios/app/spl/id293573990)
- [FFT](https://appshunter.io/ios/app/fft/id298840058)
- [RT60](https://appshunter.io/ios/app/rt60/id298840320)
- [Generator](https://appshunter.io/ios/app/generator/id298840802)

All apps by Andrew Smith: https://appshunter.io/developer/291822462

## Related topics

[audio spectrum analyzer eq rta](https://appshunter.io/ios/topics/audio-spectrum-analyzer-eq-rta) · [rta audio](https://appshunter.io/ios/topics/rta-audio) · [rta audio tool](https://appshunter.io/ios/topics/rta-audio-tool) · [octave rta](https://appshunter.io/ios/topics/octave-rta) · [rta analyzer](https://appshunter.io/ios/topics/rta-analyzer) · [real time analyzer](https://appshunter.io/ios/topics/real-time-analyzer)

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-29.*