# PocketRTA Ultra

> Portable real-time spectrum analyzer for iPhone and iPad. (iPhone/iPad app by 4Pockets.com.)

- Source: https://appshunter.io/ios/app/pocketrta-ultra/id514903914 (this page in markdown: same URL + `.md`)
- Developer: [4Pockets.com](https://appshunter.io/developer/370131860)
- Category: Music, Utilities
- Price: $6.99
- Rating: 4.10/5 from 17 App Store ratings · 5 written reviews indexed
- Age rating: 4+
- Requires: iOS 9.0 · 10 MB
- Languages: American English
- Released: 2012-04-09
- Data updated: 2026-08-25
- Monetization: paid
- User reviews in markdown: https://appshunter.io/ios/app/pocketrta-ultra/id514903914/reviews.md

## What is PocketRTA Ultra?

Pocket RTA Ultra is a highly portable award winning real-time spectrum analyser for the iPhone.

Pocket RTA Ultra has many advanced features which are normally only found in much more expensive sound analysis software, providing fast and accurate spectrum analysis suitable for both amateur hi-fi enthusiasts and professional A/V engineers. Uses include system calibration, monitoring of noise levels and testing of audio equipment. 

PocketRTA samples sounds using either internal or external microphones and then applies a Fourier Transform to the samples to obtain a frequency spectrum. The result is an accurate representation of the sampled sound broken down into its frequency components. 

Various display modes include, linear narrow band, logarithmic narrow band, Octave, 1/3 Octave, 1/6 Octave, RT60, SPL and Spectrogram displays with ANSI A and C weighting curves. Use the iPhone's multi-touch interface to perform real-time magnification of displays. The touch screen allows selection of the nearest FFT point giving a display of it's frequency and decibel level. Up to 32 times oversampling allow more stable readings for fluctuating or unstable input signals whilst our unique noise cancellation system allows you to remove unwanted background noise. 

PocketRTA features the ability to calibrate the display using a 1/3 Octave display in order to compensate for imperfections in frequency response of both internal and external microphones. The program automatically detects and switches between both sets of calibration data.

Pocket RTA has the ability to capture up to 3 input signals and overlay them as a reference over live input. All display modes allow exporting of graphed data to the camera roll in JPEG format. These images can then by synced, transferred via FTP or emailed to your desktop PC for better analysis.

-Variable Sample Rate from 8K to 48K. 
-Definable FFT frame sizes up to 8K (16K on 4s).
-Standard ANSI/IEC A and C weighting curves. 
-32bit floating point sampling.
-Up to 32x oversampling. 
-Smoothing (alternative to averaging).
-Automatic noise cancellation. 
-Automatic peak note / frequency and octave display. 
-Narrow band Linear and Logarithmic scalable displays. 
-Spectrogram display with Log and Linear Modes. 
-1:1, 1:3 and 1:6 octave displays. 
-SPL (Sound Pressure Level) display. 
-RT60 Calculations on Impulse Recordings.
-Mixer Mode.
-LEQ Mode (Equivalent Continuous Sound Level).
-10x zoom for accurate analysis of narrow band data. 
-Variable definable decibel scales.
-EPPO Mode (Equal Points Per Octave).
-Signal Generator (log/linear sweep tones, sine, pink, white, saw, square and impulse).
-Touch screen display of nearest point with frequency and decibel readout. 
-Independent gain controls for both internal and external microphones. 
-Pause facility freezes the live trace to aid analysis of data. 
-Independent 1/3 Octave Calibration of internal and external microphones. 
-Capture Buffers allow an additional 3 reference traces to be displayed. 
-Camera Roll capture facility.
-Save & Load Profiles (for multiple calibration and graph settings).
-Export and Email CSV data.
-FTP server to backup configuration files and exported data.
-Peak trace facility for better reading of fluctuating frequencies. 
-Capture peaks over time facility. 
-Full Screen Mode (removes toolbars etc.).
-Fast display update even with large FFT sizes.

Whats New In Pocket RTA Ultra
=============================

-Variable Sample Rate from 8K to 48K. 
-Added 8K 16K FFT Sizes for more accurate measurement.
-Improved 32bit floating point sampling.
-Smoothing (alternative to averaging).
-Improved SPL (Sound Pressure Level) display with LEQ mode. 
-RT60 Calculations on Impulse Recordings.
-Variable definable decibel scales.
-Improved Signal Generator with log & linear sweep tones.
-Save & Load Profiles (for multiple calibration and graph settings).

## Key features

- Real-time spectrum analysis
- Multiple display modes (Octave, Spectrogram, RT60)
- Noise cancellation
- Microphone calibration
- Reference signal overlay
- Data export to JPEG

## Recent user reviews (5 of 5)

All indexed reviews: https://appshunter.io/ios/app/pocketrta-ultra/id514903914/reviews.md

### 1/5 — Cuts off airplay music

*2022-12-31*

Using this app cuts off music going to AirPort Express.

### 1/5 — Where is Pocket RTA Pro?

*2019-06-08*

klk

**Developer response:** RTA Pro was discontinued and replaced with this which runs on iPhone and iPad and uses Apple's M3 chip for faster operation. RTA Pro has been in service for over 7 years and the codebase was too out-of-date.

### 5/5 — RTA Ultra

*2018-08-05*

GREAT  .. Worth every penny

### 1/5 — RTA Ultra

*2017-03-10*

Does not work at all. Save your money.

### 5/5 — Remarkable

*2012-05-23*

What a great pocket tool. I intend to use it to get maximum gain before feedback in live settings, especially when using lavalier microphones. The wealth of features is terrific.

## Frequently asked questions about PocketRTA Ultra

### What is PocketRTA Ultra?

PocketRTA Ultra is a portable real-time spectrum analyzer for iPhone and iPad. It provides advanced sound analysis features for system calibration, noise monitoring, and audio equipment testing.

### How does PocketRTA Ultra analyze sound?

It samples sounds using internal or external microphones and applies a Fourier Transform to obtain a frequency spectrum, breaking down the sound into its frequency components.

### What display modes does PocketRTA Ultra offer?

PocketRTA Ultra offers linear narrow band, logarithmic narrow band, Octave, 1/3 Octave, 1/6 Octave, RT60, SPL, and Spectrogram displays with ANSI A and C weighting curves.

### Can PocketRTA Ultra calibrate microphones?

Yes, PocketRTA Ultra can calibrate the display using a 1/3 Octave display to compensate for microphone imperfections. It automatically detects and switches between calibration data for internal and external microphones.

### Does PocketRTA Ultra have ads?

No, PocketRTA Ultra does not contain advertisements. It is a paid application.

### What devices is PocketRTA Ultra compatible with?

PocketRTA Ultra is compatible with iPhone, iPad, and iPod devices. It requires iOS 4.3 or later.

### How often is PocketRTA Ultra updated?

The latest version, 1.61, was released on April 4, 2018. While updates have not been frequent recently, the app is stable and functional for its intended purpose.

### What is the price of PocketRTA Ultra?

PocketRTA Ultra is available for a one-time purchase of $6.99.

## Version history (last 5 releases)

### 1.61 — 2018-04-04

This update from Apple will improve the functionality of this app. No new features are included.

Minor Bug Fix with Push Notifications
Added the ability to switch the scale resolution for slower devices.

### 1.6 — 2018-03-27

Added Web Server to retrieve Files
Fixed an issue where 16K FFT's weren't selectable on some devices.
Fixed an issue with the RT60 option crashing on occasions.
The app is now iPad compatible.

### 1.5 — 2018-03-16

Minor bug fixes.

### 1.4 — 2018-01-23

Added 16K FFT Option.
Fixed icon display issues on iOS11.
Fixed screen rotation issue.

### 1.3 — 2017-01-20

Fixed an issue with blurry fonts on graph scales.
Improved the quality of the snapshot function.
Minor fixes for iOS10.

## Apps similar to PocketRTA Ultra

| App | Rating | Price | Category |
| --- | --- | --- | --- |
| [RTA](https://appshunter.io/ios/app/rta/id298839433) | 4.0 (25) | $4.99 | Music |
| [FFT](https://appshunter.io/ios/app/fft/id298840058) | 4.0 (6) | $10.99 | Music |
| [AudioTools, dB, Sound & Audio](https://appshunter.io/ios/app/audiotools-db-sound-and-audio/id325307477) | 4.8 (5,060) | $19.99 | Music |
| [RT60](https://appshunter.io/ios/app/rt60/id298840320) | 3.4 (5) | $34.99 | Music |
| [Ultrasonic Analyzer](https://appshunter.io/ios/app/ultrasonic-analyzer/id851069926) | 3.9 (34) | $19.99 | Music |
| [Sound Spectrum Pro](https://appshunter.io/ios/app/sound-spectrum-pro/id1632089486) | 5.0 (1) | $12.99 | Music |

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All apps by 4Pockets.com: https://appshunter.io/developer/370131860

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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 2026-08-25.*