# Spectrum Analyzer RTA — Sound Frequency Analyzer

> Real-time audio analysis app for sound frequency measurement and visualization. (iPhone/iPad app by ONYX Apps.)

- Source: https://appshunter.io/ios/app/spectrum-analyzer-rta/id490078884 (this page in markdown: same URL + `.md`)
- Developer: [ONYX Apps](https://appshunter.io/developer/356553882)
- Category: Music, Utilities
- Price: $19.99
- Rating: 4.30/5 from 67 App Store ratings · 99 written reviews indexed
- Age rating: 4+
- Requires: iOS 11.0 · 7 MB
- Released: 2012-10-04
- Data updated: 2026-08-27
- Monetization: paid
- User reviews in markdown: https://appshunter.io/ios/app/spectrum-analyzer-rta/id490078884/reviews.md

## What is Spectrum Analyzer RTA?

***** "As a former IEEE Technical Committee Chair for Signal Processing, I find this app amazingly flexible and useful. Works very well with its proper designed-in control selections." - Roblake 

Spectrum Analyzer for iOS is a powerful real-time audio analysis app. Designed with musicians and recording engineers in mind, it can also be used by anyone interested in the world of sound. Ideal for room tuning or speaker tuning, the app enables portable, precision audio measurement and visualization. 

Feature Highlights: 
● Octave Band Real Time Analyzer 
● FFT Plot (Fast Fourier Transform) 
● Spectrograph module 
● Test Tone and White/Pink Noise Generator 
● Native iPhone X graphics

>>> Check out the demo videos at SpectrumAnalyzerApp.com 

Audio input may be acquired via the built-in microphone or an external measurement microphone. For best results we recommend using a calibrated measurement microphone connected via USB audio interface or iPhone dock connector. This allows for high precision and flat frequency response, as well as for stereo input.

Audio credits:
"Basement Floor" and "Enchanted Journey" by Kevin MacLeod
"Evening Birdsong" and "Cuckoo" by Benboncan

## Key features

- Octave Band Real Time Analyzer
- FFT Plot
- Spectrograph module
- Test Tone Generator
- White/Pink Noise Generator

## Chart rankings

- #137 in Top Paid · Music (US App Store)

## Recent user reviews (10 of 99)

All indexed reviews: https://appshunter.io/ios/app/spectrum-analyzer-rta/id490078884/reviews.md

### 5/5 — Excellent and very useful.

*2024-09-30*

Now working perfectly with my iOS 18 iPhone and iPad.

### 5/5 — Profi App zum fairen Preis

*2024-09-10*

In hab die App auf meinen Pro Ipads nebst einem iphone und ipod laufen und kann sie schnell nutzen, um leise nervende Geräusche im Wasserfall aufzuspüren.
Was mich echt überraschte war die 100HZ Linie bei echten Glühbirnen.
Danke an die Entwickler:innen und top, dass ihr kein Abo-Modell habt.
Weiter so!

### 4/5 — 希望作者适配一下全面屏的pad

*2023-06-12*

辛苦作者适配一下全面屏的pad

### 5/5 — Wow, just wow. Doesn’t just work, it shines

*2022-06-11*

Full features and very responsive Octave RTA, which accepts both uncalibrated and calibrated microphones like iDSP ones. 
Has a full FFT plot as well.
Spectrograph is really useful to identify sources of that annoying pitch you can hear among all the noise. 
Perfectly fluent user interface, simple yet fully functional. No delays, no glitches, the spectrum just comes alive on the screen. I can not describe how fluid the user interface feels - you just have to try. This is truly impressive! 
Check out their web site for a neat tutorial on how to EQ a room!

### 4/5 — How to upload mic cal file?

*2021-12-28*

I can’t upload anything in the mic section. How do you upload a file when it doesn’t let you? I click on it and it just exits out of the mic screen. Please fix.

### 5/5 — Visually beautiful, and exactly what I expected technically

*2021-10-04*

Bought this to measure a high-frequency hum which disappeared when I bought the app. So thanks for that. Seriously, though, a very nice UI wrapper around the FFT.

### 5/5 — Best RTA on the App Store, PLEASE UPDATE!

*2021-01-26*

i’m very pleased by this Spectrum Analyzer; it is the only one that I’ve found that can run at full speed on an iPad Air 2! A+

To the devs; if you’re still updating this app, i’d appreciate a way to select other inputs on audio interfaces; I’d love the ability to monitor what’s coming into inputs 3+4.

### 5/5 — Absolute perfection

*2021-01-12*

I have used this app for many many years and made lots of money fixing sound issues. Also, the Spectrograph at max sensitivity can find any power whine to help regain your sanity. 10/10

### 3/5 — Was great but doesn’t work

*2021-01-05*

with the newer IOS operating systems on my iphone.

**Developer response:** Hi, Sorry for the inconvenience. This is a known issue with the latest iOS update. Simply delete and reinstall the app and it should work. With any issues, please contact us directly at apps@onyx3.com

### 5/5 — Solving the app problem very fast

*2020-12-11*

The app did not work and I reported that. However afterward it has been fixed and reported very fast. So I gave the team 5 Stars not just for the good program but also for their fast response on solving the problem

**Developer response:** Hi, Sorry for the inconvenience. This is a known issue with the latest iOS update. Simply delete and reinstall the app and it should work. With any issues, please contact us directly at apps@onyx3.com

## Frequently asked questions about Spectrum Analyzer RTA

### What does the Spectrum Analyzer RTA app do?

This app is a powerful real-time audio analysis tool that measures and visualizes sound frequencies. It's designed for tasks like room tuning and speaker tuning, offering precision audio measurement capabilities.

### What are the key features of Spectrum Analyzer RTA?

Key features include an Octave Band Real Time Analyzer, FFT Plot, Spectrograph module, and generators for test tones, white noise, and pink noise. It supports input from both built-in and external microphones.

### How much does Spectrum Analyzer RTA cost?

Based on the provided information, this application is a paid app. There are no mentions of in-app purchases or advertisements, indicating a one-time purchase model.

### What devices is Spectrum Analyzer RTA compatible with?

The app is designed for iOS devices, with specific mention of native iPhone X graphics. For best results with high precision, it recommends using a calibrated measurement microphone connected via a USB audio interface or iPhone dock connector.

### Who would benefit from using Spectrum Analyzer RTA?

This app is ideal for musicians and recording engineers who need to analyze audio for tuning rooms or speakers. It's also useful for anyone interested in understanding sound frequencies and performing portable, precision audio measurements.

## Version history (last 5 releases)

### 1.9.5 — 2018-11-19

Thank you for helping us improve Spectrum Analyzer app! Please rate it on the App Store now, so we can make it even better!

● Toggle between Flat, A and C weighted modes
● Snapshot overlay for quick comparison (RTA module)

### 1.9.3 — 2018-10-31

Thank you for helping us improve Spectrum Analyzer app! Please rate it on the App Store now, so we can make it even better!

● Support for the latest iOS and devices
● Fixed microphone permission issue with iOS 12

### 1.9.1 — 2015-08-12

Thank you for helping us improve Spectrum Analyzer app! Please rate it on the App Store now, so we can make it even better! 

● 64-bit
● Mic calibration
● Minor fixes

### 1.7 — 2014-12-21

Thank you for helping us improve Spectrum Analyzer app! Please rate it on the App Store now, so we can make it even better! 

● Native iPhone 6 graphics
● Does not mute other audio
● Audio Interface Settings
● Stability improvements

### 1.3 — 2013-05-02

Thanks for helping us improve Spectrum Analyzer! Please rate it on the app store now, so we can make it even better! 

● Minor fixes

## Apps similar to Spectrum Analyzer RTA

| App | Rating | Price | Category |
| --- | --- | --- | --- |
| [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 |
| [Decibel meter for personal use](https://appshunter.io/ios/app/decibel-meter-for-personal-use/id6448749318) | 4.5 (28) | Free | Music |
| [Audio / Spectrum Analyzer](https://appshunter.io/ios/app/audio-spectrum-analyzer/id1508848574) | 4.6 (1,013) | Free | Music |

## More apps by ONYX Apps

- [Oscilloscope](https://appshunter.io/ios/app/oscilloscope/id388636804)
- [LED Audio Spectrum Visualizer](https://appshunter.io/ios/app/led-audio-spectrum-visualizer/id396083500)
- [ClockMaster - Time Regulator](https://appshunter.io/ios/app/clockmaster-time-regulator/id413901882)
- [Metronome Ϟ](https://appshunter.io/ios/app/metronome/id416443133)
- [Octave RTA](https://appshunter.io/ios/app/octave-rta/id569156857)

All apps by ONYX Apps: https://appshunter.io/developer/356553882

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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 2026-08-27.*