# iAudioTool

> Professional audio analysis toolkit for sound measurement and generation. (iPhone/iPad app by Julian Bunn.)

- Source: https://appshunter.io/ios/app/iaudiotool/id580740399 (this page in markdown: same URL + `.md`)
- Developer: [Julian Bunn](https://appshunter.io/developer/580740402)
- Category: Music, Utilities
- Price: $2.99
- Rating: 3.30/5 from 13 App Store ratings · 25 written reviews indexed
- Age rating: 4+
- Requires: iOS 16.0 · 1 MB
- Languages: American English
- Released: 2012-11-28
- Data updated: 2026-09-04
- Monetization: paid
- User reviews in markdown: https://appshunter.io/ios/app/iaudiotool/id580740399/reviews.md

## What is iAudioTool?

Room Reverberation (RT60), SPL (dB) Meter, Spectrum Analyzer, Signal Generator, Polarity Checker.
 
Features 1/1, 1/3 & 1/6 octave RTA modes, Leq, RT60 (wideband, and Octave), spectrogram, peak frequency, Fast, Medium & Slow filters, Flat & A/C Weighting, Averaging, SPL Chart Recorder, Noise Criteria (NC), White/Pink Noise, Sine, Square, Triangle, Sweep, Ramp and Impulse signals & loudspeaker polarity checker. Frequency spectrum store & load, RT60 store,  and Chart store. Stored files can be sent as Email.

Includes ISO Octave Calibration feature - corrects for your device's microphone response. Also includes wideband calibration. The calibration discs are moved up or down so as to obtain a flat response, and match the overall SPL to that of an external meter.

Use: home theater, audio engineer, car audio, etc

Online manual at: https://sites.google.com/site/bofinit/iaudiotool

Please join the AudioTool Discussion Group to request features or report problems:

http://groups.google.com/group/audiotool-discussion-group

AudioTools's Spectrum Analyzer component uses FFT on batches of samples recorded at the microphone. Hann windowing reduces aliasing. Recorded spectra may be stored as files in the device memory, and then loaded later and displayed together with the live spectrum. 

The "Store" button will store the current live spectrum. The "Load" button brings up a list of stored spectra. One of these can be chosen, or the "Cancel" item selected to return to the main display, or the "Clear" item selected to remove the currently loaded spectrum.

Data collection can be paused and restarted.

The deciBel meter component uses IIR filters and exponential averaging to calculate Flat, A and C weighted response at speeds of Fast, Medium and Slow.

A pair of cursors can be shown on the RTA and Chart Recorder displays: each can be moved to any position, and will display the SPL & time/frequency values measured there. Initially, both cursors are positioned mid-screen - simply drag them to a new position with the fingertip. The cursors can be turned on and off in the Menu.

The loudspeaker polarity checker can be used to check whether a loudspeaker is wired in phase: connect the AudioTool output to the speaker under test, select "Polarity" from the signal generator screen, then return to the RTA screen. If the speaker is out of phase (polarity reversed) AudioTool will show "Pol ---", otherwise "Pol +++" if the speaker is in phase.

The Noise Criteria (available from the Menu) function shows  a set of NC contours overlaid on the 1/1 Octave RTA display and the calculated real time current NC value is also shown.

The Chart Recorder shows a moving trace of the SPL measurements over the last few minutes.

Reverberation (RT60) measurements can be made by starting the RT60 component and using a loud clap (or similar) to trigger the measurement. RT60 times measure how much reverberation or echo there is in a room or auditorium.

The Signal Generator generates White and Pink Noise, Sine, Square, Triangle and Ramp waves, and Impulses. The generator uses multiple cycled buffers that are refreshed randomly so ensuring truly random White/Pink noise. The Pink Noise algorithm uses Kemmet's method to adjust White Noise into Pink.

Sine/Square/Ramp/Triangle Frequency can be set via the arrow buttons or directly entered using the keyboard.

The Impulse signal is a delta, issued approximately once per second. 

The accuracy in frequency of the generated periodic signals is quite good: on the iPad, errors were of the order of 1% throughout most of the range. Sine wave fidelity is good throughout most of the audio range. Other signals' leading and trailing edges show ringing and decreasing frequency response artefacts in the upper ranges.

Disclaimer: iAudioTool's performance depends on the iPad/iPhone hardware, and is not guaranteed to meet any audio measurement or safety standards.

## Key features

- RT60 measurement
- SPL meter
- Spectrum analyzer
- Signal generator
- Polarity checker
- ISO Octave Calibration

## Chart rankings

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

## Recent user reviews (10 of 25)

All indexed reviews: https://appshunter.io/ios/app/iaudiotool/id580740399/reviews.md

### 1/5 — Signal generator is broken

*2026-07-27*

Pink noise does not work.

### 2/5 — WAS a great app, what a shame

*2025-09-20*

This app used to have a built in signal generator. It still looks like it does, but half of the functions don’t work at all like pink noise (very important), impulse, and white noise.  The functions that kinda work have very choppy output (sin wave) making them completely useless. The link to the Google group is dead, so I assume this software is too.

### 2/5 — Please release March 2024: Versions 8.6

*2024-07-12*

Please release March 2024: Versions 8.6 that reflects the calibration of Dayton Audio iMM-6C.

### 1/5 — RTA funciona porem Gerador pink e white não

*2023-03-20*

Muito a melhorar ainda

### 1/5 — No running Pink & White Noise

*2022-12-13*

Pink noise and white noise do not work on ipad and iphone.
Please test properly.

### 1/5 — Why doesn't the function work after ios16?

*2022-12-13*

Why doesn't the function work after ios16?
My MacBook is not recognizing my microphone.
Only generators work.

### 5/5 — Working now!

*2022-12-08*

Thanks for the update.  It’s now working on my iPhone (iOS 16.1.2)

### 1/5 — Unusable

*2022-11-11*

Does not work anymore!!!

**Developer response:** Latest version fixes problems in iOS16.

### 3/5 — Change in 16.

*2022-10-18*

The app worked fine until I upgraded to iOS 16. Now the app does not give any indication that it is receiving any audio.

**Developer response:** Latest version fixes problems in iOS16.

### 1/5 — Problem Solving

*2022-09-30*

The app isn't working Please let the update fix the problem!

## Frequently asked questions about iAudioTool

### What is iAudioTool used for?

iAudioTool is used for professional audio analysis, including measuring room reverberation (RT60), sound pressure levels (SPL), analyzing frequency spectrums, and generating various audio signals. It's designed for applications like home theater setup, professional audio engineering, and car audio tuning.

### Does iAudioTool have ads?

No, iAudioTool is ad-free, allowing for an uninterrupted user experience during critical audio analysis tasks.

### What devices does iAudioTool support?

iAudioTool is available for iPhone and iPad devices, offering powerful audio analysis capabilities on the go.

### How accurate are iAudioTool's measurements?

iAudioTool includes an ISO Octave Calibration feature to correct for your device's microphone response and perform wideband calibration. This helps in matching the overall SPL to that of an external meter for improved accuracy.

### Can I save and share my audio analysis data with iAudioTool?

Yes, iAudioTool allows you to store frequency spectra, RT60 measurements, and chart recordings. These stored files can then be sent via email for further analysis or sharing.

### What audio signals can iAudioTool generate?

iAudioTool can generate White/Pink Noise, Sine, Square, Triangle, Sweep, and Ramp signals, along with an Impulse signal for various testing and calibration purposes.

### How does iAudioTool check loudspeaker polarity?

You can use iAudioTool's loudspeaker polarity checker by connecting the app's output to the speaker under test. If the speaker is out of phase, iAudioTool will display 'Pol ---'; otherwise, it will show 'Pol +++' if the speaker is in phase.

### What is the update frequency for iAudioTool?

iAudioTool was last updated on December 7, 2022, with version 5.7.1. While specific update frequency isn't detailed, this indicates ongoing development and support for the application.

## Version history (last 5 releases)

### 5.7.1 — 2022-12-07

Fixes issue in iOS16 related to mono sampling from the microphone.

### 5.7.0 — 2022-09-27

Fix for rotation issues in iOS16.

### 5.6.16 — 2017-08-25

This app has been updated by Apple to display the Apple Watch app icon.

Fix for reported rotation grey screen issues.

### 5.6.14 — 2015-09-15

Fix for Load and email menu choice errors.

### 5.6.13 — 2015-08-22

v5.6.13 Restore cursor interactivity
         Minor cosmetic changes

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## Related topics

[iaudiotool](https://appshunter.io/ios/topics/iaudiotool) · [audio tool](https://appshunter.io/ios/topics/audio-tool)

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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 2026-09-04.*