# Room Impulse Response — Acoustics analyzer

> Acoustic analyzer for rooms and loudspeakers, generating and visualizing impulse responses. (iPhone/iPad app by Andrew Smith.)

- Source: https://appshunter.io/ios/app/room-impulse-response/id805907763 (this page in markdown: same URL + `.md`)
- Developer: [Andrew Smith](https://appshunter.io/developer/291822462)
- Category: Music, Utilities
- Price: $49.99 with in-app purchases
- Age rating: 4+
- Requires: iOS 13.0 · 35 MB
- Languages: American English, European Spanish, German (Germany), Polish, Chinese (Simplified, China), French (France), Swedish, Japanese
- Released: 2014-02-01
- Data updated: 2026-08-14
- Monetization: paid
- User reviews in markdown: https://appshunter.io/ios/app/room-impulse-response/id805907763/reviews.md

## What is Room Impulse Response?

Room Impulse Response measures audio characteristics of a room or loudspeaker.

Start by recording an impulse, such as a handclap or balloon pop, or record a swept sine and use the built-in deconvolution to create your Impulse Response (IR).

Now, view the ETC, with RT60 decay cursors, apply windowing if you wish, or trim the IR.

Next, see these other graphs:

** Impulse, where you can play back the actual IR

** ETC, which includes cursors to read out RT60 times directly, and allows pinch-zoom gesture for trimming the file. Apple a window, and see the effects of the window on the ETC plot.

** Schroeder curve, with EDT, T10, T20, and T30 markers

And then see these charts, all in either in Octave or 1/3 Octave bands:

** T20 or T30 (RT60) times

** Reverb Early Decay Times (EDT) 

** Clarity C50

** Clarity C80

** CT times

** Definition

** Signal / Noise 

And then you can also do spectral analysis, using our FFT, which can be windowed, for analyzing loudspeaker response without reflections, or see the 3D waterfall plot to view the decay of sound in the room by frequency, over time. 

Works great with the internal iOS device microphone, or attach or iTestMic or iAudioInterface2 for fully professional results.

See the other great apps by Studio Six Digital, including AudioTools.

## Key features

- Record impulse or swept sine
- Generate Impulse Response (IR)
- View ETC with RT60 cursors
- Analyze Schroeder curve (EDT, T10, T20, T30)
- Spectral analysis with FFT
- 3D waterfall plot for sound decay

## Pricing and in-app purchases

Base price: $49.99.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Reference Curves Option | $14.99 | one-time |


## Recent user reviews (2 of 2)

All indexed reviews: https://appshunter.io/ios/app/room-impulse-response/id805907763/reviews.md

### 3/5 — Calculer les délais

*2019-04-12*

Il aurait été bien de pouvoir avoir plusieurs réponses IR pour calculer les délais entre plusieurs enceintes et de les mettre en phase .

### 1/5 — 不能用

*2018-08-27*

毛线。不能用

## Frequently asked questions about Room Impulse Response

### What is Room Impulse Response used for?

Room Impulse Response is used to measure and analyze the acoustic characteristics of a room or loudspeaker. It helps users understand how sound behaves within a space and the performance of audio playback systems.

### How do I create an Impulse Response with Room Impulse Response?

You can create an Impulse Response by recording an impulse sound, such as a handclap or balloon pop, or by recording a swept sine and using the app's deconvolution feature.

### What acoustic metrics can I view in Room Impulse Response?

The app allows you to view metrics like RT60 decay, EDT, T10, T20, T30, Clarity C50, Clarity C80, CT times, Definition, and Signal/Noise ratios. It also offers spectral analysis using FFT.

### Does Room Impulse Response work on different devices?

Yes, Room Impulse Response is supported on iPhone, iPad, and iPod devices, making it versatile for various iOS users.

### What is the price of Room Impulse Response?

Room Impulse Response is a paid application, with a current price of $49.99.

### How often is Room Impulse Response updated?

The app was last updated on December 27, 2025, indicating ongoing development and support. The latest version available is 5.0.

### Can I use Room Impulse Response with external microphones?

Yes, Room Impulse Response works with the internal iOS device microphone, but it also supports professional results when used with external microphones like the iTestMic or iAudioInterface2.

### What is the age rating for Room Impulse Response?

Room Impulse Response has an age rating of 4+, making it suitable for a wide range of users interested in audio analysis.

## Version history (last 5 releases)

### 5.0 — 2025-12-27

-Fixed a possible crash on launch

### 4.9 — 2025-12-22

-Added Group Delay plot
-Bug fixes and stability improvements

### 4.8 — 2025-11-24

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

### 4.7 — 2024-11-20

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

### 4.6 — 2024-07-10

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

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## More apps by Andrew Smith

- [Speaker Polarity](https://appshunter.io/ios/app/speaker-polarity/id293263027)
- [SPL](https://appshunter.io/ios/app/spl/id293573990)
- [RTA](https://appshunter.io/ios/app/rta/id298839433)
- [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

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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 2026-08-14.*