# Noise Spectrum Logger

> Real-time sound frequency spectrum analyzer and logger. (iPhone/iPad app by Yukiko Iwai.)

- Source: https://appshunter.io/ios/app/noise-spectrum-logger/id1153920486 (this page in markdown: same URL + `.md`)
- Developer: [Yukiko Iwai](https://appshunter.io/developer/965630131)
- Category: Education, Utilities
- Price: Free with in-app purchases
- Rating: 5.00/5 from 1 App Store ratings
- Age rating: 12+
- Requires: iOS 15.5 · 5 MB
- Languages: American English, Japanese
- Released: 2016-09-25
- Data updated: 2026-07-07
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/noise-spectrum-logger/id1153920486/reviews.md

## What is Noise Spectrum Logger?

1. DESPLAY
The power spectrum of sound is displayed in the range of 20 - 20000Hz.
You can zoom in/out the spectrum by pinching in/out smoothly.
Also landscape orientation is supported.

2. USEFUL
While "hold" switch is ON, the maximum values are displayed in red color.
You can select "Mean" or "RMS" as the way of smoothing the spectrum out.

3. LOGGING
By sliding "log" switch, the logging mode is started.
To choose a past log from "History" tab, you can pull it from iPhone via email as a CSV file.
The CSV file can be edited with Excel etc.

4. AVAILABLE
Without cellular data service, the full functions are available.

5. BACKGROUND PROCESSING
You can use the logging function even when iPhone in your pocket.

6. TECHNICAL NOTE
Sample rate: 44.1kHz
Bit depth: 32bit float
FFT window function: Blackman
FFT samples: 8192

## Key features

- Real-time spectrum display (20-20000Hz)
- Zoomable spectrum view
- Maximum value highlighting
- Spectrum smoothing options (Mean/RMS)
- Logging and CSV export
- Background processing
- Offline functionality

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Remove Ads | $3.99 | one-time |



## Frequently asked questions about Noise Spectrum Logger

### What is Noise Spectrum Logger used for?

Noise Spectrum Logger displays the power spectrum of sound in the 20-20000Hz range. It allows users to log this data and export it as a CSV file for further analysis in applications like Excel.

### Can I use Noise Spectrum Logger offline?

Yes, all functions of Noise Spectrum Logger are available without cellular data service. You can use its full capabilities even when offline.

### How does Noise Spectrum Logger handle background processing?

The logging function of Noise Spectrum Logger can be used even when your iPhone is in your pocket. This allows for continuous data collection without needing to actively use the app.

### What technical specifications does Noise Spectrum Logger use?

Noise Spectrum Logger utilizes a sample rate of 44.1kHz, a bit depth of 32bit float, a Blackman FFT window function, and 8192 FFT samples for its analysis.

### What is the age rating for Noise Spectrum Logger?

Noise Spectrum Logger has an age rating of 12+. This indicates it is suitable for users aged 12 and above.

### How often is Noise Spectrum Logger updated?

The latest version of Noise Spectrum Logger is 2.2, which was last updated on December 23, 2025. This suggests a relatively recent update.

### What devices does Noise Spectrum Logger support?

Noise Spectrum Logger is available on iPhone, iPad, and iPod. It is designed to function across these Apple mobile devices.

### Does Noise Spectrum Logger have ads?

No, Noise Spectrum Logger does not contain advertisements. The app is free to use without any ad interruptions.

## Version history (last 5 releases)

### 2.2 — 2025-12-23

Built with Xcode 26.2 and the latest SDKs.

### 2.1 — 2024-06-10

Recompiled using Xcode 15.3 with the latest libraries.

### 2.0 — 2022-07-24

Built with Xcode 13.4 using the latest libraries.

### 1.9 — 2021-06-12

Regenerated with Xcode 12.4 using the latest module.

### 1.8 — 2020-02-16

Supported dark mode.

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## More apps by Yukiko Iwai

- [Cycle GPS Logger](https://appshunter.io/ios/app/cycle-gps-logger/id965630132)
- [Voice Spectrogram Logger](https://appshunter.io/ios/app/voice-spectrogram-logger/id1277134462)
- [Midnight Video Camera](https://appshunter.io/ios/app/midnight-video-camera/id1326773583)
- [暦日ビューア](https://appshunter.io/ios/app/id1445348476)
- [3D Data Plot](https://appshunter.io/ios/app/3d-data-plot/id1515003548)

All apps by Yukiko Iwai: https://appshunter.io/developer/965630131

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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 2026-07-07.*