# iSeismometer vs Noise Spectrum Logger

The clearest difference is rating: Noise Spectrum Logger at 5.0 against iSeismometer's 3.6. iSeismometer's advantage is in-app purchases (none vs 1) and ratings volume (172 vs 1). On price, update cadence, ads and monetization model there is nothing between them.

Both are free to download. Noise Spectrum Logger sells 1 one-off in-app purchase. iSeismometer asks for nothing beyond the download.

Noise Spectrum Logger holds the better App Store score, 5.0 against 3.6. That said, the two scores are not equally well evidenced: iSeismometer has 172 ratings behind it against 1, so its average is the more settled of the two.

iSeismometer ships an update every 7 months, Noise Spectrum Logger every 10 months. The most recent releases landed on October 31, 2026 and November 2, 2026 respectively.

## The numbers

| Metric | iSeismometer | Noise Spectrum Logger |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.6 (172 ratings)](https://appshunter.io/ios/app/iseismometer/id304190739/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/noise-spectrum-logger/id1153920486/reviews)** |
| Number of ratings | **172** | 1 |
| Positive reviews | 76.5% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 7 months** | Every 10 months |
| Monetization | Free | Free |
| Size | 3 MB | 5 MB |
| Requires iOS | 16.0 | **15.5** |
| Devices | iPhone, iPad, Mac | iPhone, iPad, iPod |
| Age rating | 4+ | 12+ |
| Developer | [ObjectGraph LLC](https://appshunter.io/developer/284700705) | [Yukiko Iwai](https://appshunter.io/developer/965630131) |

## What reviewers say

### iSeismometer

[App page](https://appshunter.io/ios/app/iseismometer/id304190739)

Transform your iPhone into a sensitive seismometer to detect and visualize vibrations. Explore its educational and data-collecting capabilities for fun or serious applications.

**Highlights:** Converts iPhone to seismometer, Detects and visualizes vibrations, Data collecting capabilities, Educational use, Adjustable frequency settings, Re-track previous data, X-Y-Z illustrated graphs

**Features:** Vision Pro support

**In-app purchases:** none

**What reviewers like**

- 🚀 Sensitive and accurate
- 👍 Simple and easy to use
- 💡 Useful for various applications (e.g. monitoring vibrations, detecting heartbeat)

**What reviewers complain about**

- 🐛 Crashes or freezes on newer devices
- 🔋 High battery consumption
- 🔒 Lacks security/privacy features (e.g. no option to disable data transmission)

**Reported bugs**

- Buttons/controls not working on newer iOS versions
- Keyboard not appearing in text input fields
- Inconsistent performance across device models

**Requested features**

- Add sensitivity control
- Implement zero control for reference plane
- Increase recording time
- Improve UI/UX (e.g. color coding, scrolling, chart speed control)
- Implement Richter scale or other measurement units


### 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 |


## Frequently asked questions

### Is iSeismometer free?

iSeismometer is free to download, with no in-app purchases.

### Is Noise Spectrum Logger free?

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

### Which has better reviews, iSeismometer or Noise Spectrum Logger?

Noise Spectrum Logger is rated higher. iSeismometer averages 3.6 out of 5 from 172 ratings, while Noise Spectrum Logger averages 5.0 from 1 ratings.

### Do iSeismometer or Noise Spectrum Logger have ads?

Neither iSeismometer nor Noise Spectrum Logger shows ads.

### Which is updated more often, iSeismometer or Noise Spectrum Logger?

iSeismometer ships an update every 7 months, and Noise Spectrum Logger every 10 months. Most recently, iSeismometer was updated on October 31, 2026 and Noise Spectrum Logger on November 2, 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.*