# RTA Pro — Audio Spectrum Analyzer

> Real-time audio spectrum analyzer for iOS devices. (iPhone/iPad app by Matthias Schorer.)

- Source: https://appshunter.io/ios/app/rta-pro/id703753970 (this page in markdown: same URL + `.md`)
- Developer: [Matthias Schorer](https://appshunter.io/developer/290579382)
- Category: Utilities, Education
- Price: $5.99
- Rating: 4.50/5 from 2 App Store ratings · 4 written reviews indexed
- Age rating: 4+
- Requires: iOS 17.6 · 12 MB
- Languages: American English, German (Germany), Chinese (Simplified, China), Chinese (Traditional, Taiwan)
- Released: 2013-09-21
- Data updated: 2026-08-24
- Monetization: paid
- User reviews in markdown: https://appshunter.io/ios/app/rta-pro/id703753970/reviews.md

## What is RTA Pro?

RTA Pro is a real time audio spektrum analyzer. It turns your iOS device into a powerful audio test system usually seen only in audio research laboratories and music studios. Such instruments are used to analyze the frequency spectrum of ambient noise, e.g. to be able to pinpoint frequencies which cause rumble in a room. Another use is the level setting setting of PA systems for concerts.

Features: RTA Pro requires iOS11 or later and has been calibrated for the microphones of most iPhones. Custom calibration is also possible. The frequency range is 32Hz to 16kHz. Linear display, as well as weightings for measuring dB(A) and dB(C) is provided. Apart from 1/3 Octave Bands and Octave Bands, RTA Pro also features the display of a Fast Fourier Transform (FFT). The speed is adjustable to impulse, 128ms and 1 second.

## Key features

- Real-time audio spectrum analysis
- Frequency range 32Hz to 16kHz
- Linear, dB(A), and dB(C) weightings
- 1/3 Octave Bands, Octave Bands, and FFT display
- Adjustable speed settings
- Custom calibration options

## Recent user reviews (4 of 4)

All indexed reviews: https://appshunter.io/ios/app/rta-pro/id703753970/reviews.md

### 5/5 — Feine App und schneller Support

*2019-09-10*

Diese App hatte mich von Anfang an überzeugt. Schön und übersichtlicher Bildschirm im Querformat, schnelles Ergebnis in der Anzeige und durch Einstellung an eine E-Mail Adresse einfacher versandt vom Messergebnis. Nicht zu vergessen den schnellen Support, der meiner Meinung nach kein Wochenende kennt und bei Problemen schnell reagiert. Danke an und für den Support

### 5/5 — Eigentlich ziemlich hilfreich!

*2015-08-16*

Ich habe das ganze Bundle von Mess- und Ton Generator Apps. Und habe damit meine Raumakustik gut nachvollziehen und verbessern können.
Bin natürlich kein Tontechniker. Aber wenn man bedenkt, dass man allein mit einem iPhone bewaffnet zu sehr aussagekräftigen Ergebnissen kommen kann: Hammer! Danke für die coolen Apps!

### 1/5 — Seit iOS 8.0.2 unbrauchbar

*2014-10-07*

Seit dem Update auf iOS 8.0.2 funktioniert die Darstellung nicht mehr. App bitte schnell nachbessern.

### 1/5 — Fehlerhafte Anzeige mit iOS 8

*2014-09-29*

Leider passt die Anzeige seit dem Update auf iOS 8 nicht mehr. Bitte schnellstmöglich beheben!

## Frequently asked questions about RTA Pro

### What is RTA Pro?

RTA Pro is a real-time audio spectrum analyzer that transforms your iOS device into a professional audio test system. It's designed for analyzing ambient noise frequencies and setting up sound systems.

### What devices does RTA Pro support?

RTA Pro supports iPhones and iPads running iOS 11 or later. It has been calibrated for the microphones of most iPhones.

### What is the frequency range of RTA Pro?

RTA Pro covers a frequency range from 32Hz to 16kHz. It offers linear display, as well as weightings for measuring dB(A) and dB(C).

### Can I customize the calibration in RTA Pro?

Yes, RTA Pro allows for custom calibration. This feature ensures accurate measurements tailored to your specific device and environment.

### What display modes are available in RTA Pro?

RTA Pro features 1/3 Octave Bands, Octave Bands, and a Fast Fourier Transform (FFT) display. The speed for these modes is adjustable.

### How much does RTA Pro cost?

RTA Pro is a paid application, priced at $5.99. There are no in-app purchases or subscriptions required.

### Does RTA Pro have ads?

No, RTA Pro is ad-free. Users can enjoy the full functionality of the app without any advertisements interrupting their analysis.

### How often is RTA Pro updated?

The latest version of RTA Pro is 4.1, last updated on December 5, 2025. Updates typically occur to improve performance and compatibility.

## Version history (last 5 releases)

### 4.1 — 2025-12-05

Improved frequency band calibration, icons moved to top and version and build number is shown in the setting screen.

### 4.0 — 2025-12-02

Completely recoded for more precision and added functionality for exporting data.

### 3.1 — 2019-09-02

Fixed screen issued on iPhones with smaller screens

### 3.0 — 2019-08-27

Supports iPhones with FaceID

### 2.3 — 2016-10-10

Calibration for iPhone 7 and 7 Plus. Also enabled use of measurement microphone i436 through the lightning headphone adapter.

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## More apps by Matthias Schorer

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All apps by Matthias Schorer: https://appshunter.io/developer/290579382

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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 2026-08-24.*