# Reverb Time Analyzer — with Octave-band Spectrogram

> Acoustic analysis tool to measure room reverberation time and analyze sound decay. (iPhone/iPad app by TOON,LLC.)

- Source: https://appshunter.io/ios/app/reverb-time-analyzer/id6497171936 (this page in markdown: same URL + `.md`)
- Developer: [TOON,LLC](https://appshunter.io/developer/633948723)
- Category: Utilities
- Price: $6.99
- Rating: 1.00/5 from 1 App Store ratings · 1 written reviews indexed
- Age rating: 4+
- Requires: iOS 26.2 · 1 MB
- Languages: American English
- Released: 2024-05-13
- Data updated: 2026-08-27
- Monetization: paid
- User reviews in markdown: https://appshunter.io/ios/app/reverb-time-analyzer/id6497171936/reviews.md

## What is Reverb Time Analyzer?

"Reverb Time Analyzer" is an acoustic analysis tool for iPhone that allows you to measure the reverberation time of a room.

Would you like to control sound reverberation in your listening room? Knowing the reverberation time is key to creating a comfortable sound space. For example, you can obtain objective data on various acoustic disturbances, such as high room reverberation, poor intelligibility, excessive flutter echo, and howling.

The app can analyze the reverberation time using the interrupted noise method, in which a random test noise signal is generated from the iPhone's speaker and then turned off.  Up to six consecutive measurements are possible, enabling reverberation time analysis and spectrogram analysis.

Features: 
- Reverberation time analysis by interrupted noise method: RT30/RT20, RT60 converted from RT30/RT20.
- Test source: White noise
- Pre-measurement checks and settings (LVL): Measurement of background noise level and adjustment of test signal output level.
- Sound pressure level measurement and result display (MSR): Up to 6 consecutive measurements. 
- Sound recording and playback function 
- Reverberation time analysis results display (RT): Reverberation decay curve, Reverberation time of each measurement, Sample average reverberation time (Avg) of valid measurement times.
- Measurement error detection function.
- Octave-band spectrogram (OCT): 1/3, 1/48 octave band. 
- Delay start time setting: 0 - 60 seconds
- Capture function (Snap)

Usage:
The following steps are used to analyze reverberation time measurements. Step 1 must be performed for each environment.
1) Pre-measurement checks and settings (LVL): Select RT30/RT20 mode. Measure the noise level with "MUTE" and confirm that the appropriate background noise level for reverberation time analysis is less than about 50dB. Then, to ensure the dynamic range of the test sound source, play the output noise signal using "NOISE" and adjust the slider so that the sound pressure level of the observed sound exceeds the red line. If the sound pressure level is insufficient, adjust the iPhone audio volume. Also, if you need to change the RT30/RT20 mode, please start over from the first step.
2) Sound pressure level measurement and result display (MSR): Tap the start button to play a burst of a test sound source and perform sound pressure level measurement and reverberation time analysis. It can be discontinued with the stop button and will automatically stop after 6 consecutive measurements. (Start button is available only when "Avg" is selected.)
3) Reverberation time analysis results display (RT): Displays the reverberation time for each measurement, the average reverberation time (Avg) for valid measurement sessions, and the reverberation decay curve.
4) Octave-band spectrogram (OCT): Displays 1/3 or 1/48 octave band spectrogram analysis results of the observed sound at each measurement session.

Notes:
- RT60 is obtained by analyzing the time variation of the gain of the observed noise cutoff sound as it decays by 60dB. Since it is quite difficult to actually achieve a dynamic range of 60dB, a reverberation time RT30 with 30dB decay is measured and converted to RT60. Additionally, RT20 is used in cases where RT30's conditions cannot be met (such as when the background noise level is extremely high), but its measurement accuracy is lower than that of RT30.
- The reverberation time may not be analyzed correctly if high levels of noise are present during the measurement of background noise or measurement test signals.
- The sound level (dB) display is the value of the sound pressure level (Z-characteristics, without frequency weighting correction) received by the iPhone's built-in microphone. Due to its flat response, it generally measures at higher values than a standard sound level meter (dBA).

Please visit our iOS app support page for more information on this app.

## Key features

- Reverberation time analysis (RT30/RT20, RT60)
- Interrupted noise method with white noise source
- Octave-band spectrogram analysis
- Background noise level measurement
- Sound pressure level measurement
- Sound recording and playback
- Measurement error detection

## Recent user reviews (1 of 1)

All indexed reviews: https://appshunter.io/ios/app/reverb-time-analyzer/id6497171936/reviews.md

### 4/5 — 端末による暗騒音レベルの違いはなぜ？

*2025-10-24*

6畳ぐらいの部屋で、暗騒音を計測すると自分のiPhone12Proだと約44dBで、iPadPro第2世代だと約29dBでした。リオン普通騒音計NL-28のA特性の値は約29〜30dBでした。端末のマイクの周波数重みづけの設定などに違いがあるためでしょうか？

**Developer response:** 当社製品をご利用いただきありがとうございます。
本アプリのサウンドレベル測定はフラットな周波数特性で計測する必要があるため、Z特性（周波数重み付けなし）でおこなっております。一般に暗騒音であれば、A特性の騒音計測値に比べてより大きなレベルで計測されます。iPhone製品シリーズや個別端末によってマイク感度にばらつきはありますが、A特性での計測値より10数dB程度高く出るのは正しい結果といえます。
なお、本アプリはiPhone向けアプリであり、ハードウェアが大きく異なるiPadでのご利用は推奨しておりませんので、ご了承願います。
当社ホームページに本アプリのサポート情報を掲載していますのでご参照ください。
どうぞよろしくお願いいたします。

## Frequently asked questions about Reverb Time Analyzer

### What is Reverb Time Analyzer used for?

Reverb Time Analyzer is an acoustic analysis tool designed to measure the reverberation time of a room. It helps users understand and control sound reverberation for a better listening experience.

### How does Reverb Time Analyzer measure reverberation time?

It uses the interrupted noise method, generating a random test noise signal from the iPhone's speaker and then turning it off. The app analyzes the subsequent sound decay to determine reverberation times.

### What types of acoustic data does Reverb Time Analyzer provide?

The app provides RT30/RT20 and RT60 reverberation times, a reverberation decay curve, and octave-band spectrogram analysis (1/3 or 1/48 octave band).

### Can Reverb Time Analyzer detect background noise?

Yes, it includes pre-measurement checks to measure background noise levels and ensures they are below approximately 50dB for accurate reverberation time analysis.

### What is the price of Reverb Time Analyzer?

Reverb Time Analyzer is a paid application priced at $5.99.

### Is Reverb Time Analyzer available on Android devices?

Based on the provided data, Reverb Time Analyzer is currently only supported on iPhones.

### How often is Reverb Time Analyzer updated?

The latest version, 4.0, was last updated on February 9, 2026, indicating a recent update. The app was initially released on May 13, 2024.

### Does Reverb Time Analyzer have ads?

No, Reverb Time Analyzer does not contain advertisements. It is a paid application without any ads.

## Version history (last 5 releases)

### 4.1 — 2026-08-18

- Improved internal processing and performance.

### 4.0 — 2026-02-09

- Improved internal processing and performance.
- Added RT20 mode.
- Updated UI design.
- Requires iOS 26.2 or later.

### 3.0 — 2025-11-03

- Minor internal processing improvements.
- Requires iOS 18.7 or later.

### 2.0 — 2025-01-29

- Minor changes to UI design.
- Requires iOS 18.2 or later.

### 1.0 — 2024-05-14

No release notes.

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All apps by TOON,LLC: https://appshunter.io/developer/633948723

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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.*