# Voice Spectrogram Logger

> Mobile app for visualizing and logging voice spectrograms. (iPhone/iPad app by Yukiko Iwai.)

- Source: https://appshunter.io/ios/app/voice-spectrogram-logger/id1277134462 (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: 1.00/5 from 1 App Store ratings · 1 written reviews indexed
- Age rating: 12+
- Requires: iOS 15.5 · 7 MB
- Languages: American English, Japanese
- Released: 2017-09-14
- Data updated: 2026-07-29
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/voice-spectrogram-logger/id1277134462/reviews.md

## What is Voice Spectrogram Logger?

1. DESPLAY
The spectrogram of voice is displayed in the range of 20 - 2500Hz.
You can zoom in/out the spectrogram by pinching in/out smoothly.
Also landscape orientation is supported.

2. USEFUL
By moving "vivid" slider, the gradation of spectrogram is controlled.
The gradation is also controlled by moving "baseline" slider in "Setting" tab and selecting "Mean" or "RMS" as the way of smoothing the spectrogram out.

3. LOGGING
When "log" switch is ON, this app runs in the logging mode.
To choose a past log from "History" tab, you can pull it from iPhone via email as a PNG file.

4. AVAILABLE
Without cellular data service, the full functions are available.
The background processing is supported.

5. TECHNICAL NOTE
Sample rate: 44.1kHz
Bit depth: 32bit float
FFT window function: Blackman
FFT samples: 4096

## Key features

- Real-time voice spectrogram display
- Adjustable frequency range (20-2500Hz)
- Zoomable spectrogram with pinch gestures
- Customizable spectrogram gradation
- Logging mode with history export
- Offline functionality

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

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


## Recent user reviews (1 of 1)

All indexed reviews: https://appshunter.io/ios/app/voice-spectrogram-logger/id1277134462/reviews.md

### 1/5 — Missing logarithmic functionality

*2022-06-28*

On the iPad Air 5, the logarithmic measurements show gaps in the measurements that look like single lines going across the screen instead of a full spectrum that appears when in linear mode.

## Frequently asked questions about Voice Spectrogram Logger

### What is the frequency range displayed by Voice Spectrogram Logger?

Voice Spectrogram Logger displays the spectrogram of voice in the range of 20 - 2500Hz. This allows for detailed analysis of lower to mid-range vocal frequencies.

### Can I export my recorded spectrograms?

Yes, when the 'log' switch is ON, you can choose a past log from the 'History' tab and pull it via email as a PNG file. This makes it easy to share or further analyze your recordings.

### Does Voice Spectrogram Logger require an internet connection to function?

No, the full functions of Voice Spectrogram Logger are available without cellular data service. It is designed to work offline, making it convenient for use anywhere.

### How can I adjust the spectrogram's appearance in Voice Spectrogram Logger?

You can control the gradation of the spectrogram by moving the 'vivid' slider. Additionally, in the 'Setting' tab, you can adjust the 'baseline' slider and select 'Mean' or 'RMS' for smoothing.

### What technical specifications does Voice Spectrogram Logger use for audio processing?

The app utilizes a sample rate of 44.1kHz, a bit depth of 32bit float, a Blackman FFT window function, and 4096 FFT samples for its audio processing.

### What devices is Voice Spectrogram Logger compatible with?

Voice Spectrogram Logger is supported on iPhone, iPad, and iPod devices. It also supports landscape orientation for a better viewing experience.

### How often is Voice Spectrogram Logger updated?

The latest version of Voice Spectrogram Logger is 1.9, last updated on December 23, 2025. This indicates a recent update, suggesting ongoing development and support.

### What is the user sentiment for Voice Spectrogram Logger based on ratings?

Voice Spectrogram Logger has a rating of 1.0 stars from 1 rating. This single rating suggests potential areas for improvement or a limited user base providing feedback.

## Version history (last 5 releases)

### 1.9 — 2025-12-23

Built with Xcode 26.2 and the latest SDKs.

### 1.8 — 2024-06-10

Recompiled using Xcode 15.3 with the latest libraries.

### 1.7 — 2022-12-11

Regenerated with Xcode 14.1 using the latest module.

### 1.6 — 2021-06-12

Regenerated with Xcode 12.4 using the latest module.

### 1.5 — 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)
- [Noise Spectrum Logger](https://appshunter.io/ios/app/noise-spectrum-logger/id1153920486)
- [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 2026-07-29.*