# Noise Spectrum Logger vs おたすけTopik

The clearest difference is update cadence: おたすけTopik at monthly against Noise Spectrum Logger's every 10 months. おたすけTopik also leads on iOS requirement (12.0 vs 15.5). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Noise Spectrum Logger sells 1 one-off in-app purchase and おたすけTopik sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

Noise Spectrum Logger ships an update every 10 months, おたすけTopik monthly. The most recent releases landed on October 7, 2026 and October 28, 2026 respectively.

## The numbers

| Metric | Noise Spectrum Logger | おたすけTopik |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/noise-spectrum-logger/id1153920486/reviews)** | — |
| Number of ratings | **1** | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 10 months | **Monthly** |
| Monetization | Free | — |
| Size | 5 MB | 184 MB |
| Requires iOS | 15.5 | **12.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 12+ | 4+ |
| Developer | [Yukiko Iwai](https://appshunter.io/developer/965630131) | [jongseo won](https://appshunter.io/developer/1691076998) |

## What reviewers say

### Noise Spectrum Logger

[App page](https://appshunter.io/ios/app/noise-spectrum-logger/id1153920486)

Visualize sound frequencies in real-time with a dynamic spectrum display. Log and export audio data for analysis, with options for smoothing and background processing. Access all features offline.

**Highlights:** 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

**Features:** macOS Compatibility

**In-app purchases (1)**

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


### おたすけTopik

[App page](https://appshunter.io/ios/app/topik/id6747324014)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| おたすけ Topik Plus | $7.99 | one-time |


## Frequently asked questions

### Is Noise Spectrum Logger free?

Noise Spectrum Logger is free to download, with in-app purchases available.

### Is おたすけTopik free?

おたすけTopik is free to download, with in-app purchases available.

### Do Noise Spectrum Logger or おたすけTopik have ads?

Neither Noise Spectrum Logger nor おたすけTopik shows ads.

### Which is updated more often, Noise Spectrum Logger or おたすけTopik?

Noise Spectrum Logger ships an update every 10 months, and おたすけTopik monthly. Most recently, Noise Spectrum Logger was updated on October 7, 2026 and おたすけTopik on October 28, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*