# Noise Spectrum Logger vs Stochastic Signal Processing

The clearest difference is in-app purchases: Stochastic Signal Processing at none against Noise Spectrum Logger's 1. Stochastic Signal Processing also leads on update cadence (every 5 weeks vs every 10 months) and ratings volume (6 vs 1). Noise Spectrum Logger's advantage is rating (5.0 vs 4.7). On price, ads, monetization model and device support there is nothing between them.

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

Noise Spectrum Logger holds the better App Store score, 5.0 against 4.7. That said, the two scores are not equally well evidenced: Stochastic Signal Processing has 6 ratings behind it against 1, so its average is the more settled of the two.

Noise Spectrum Logger ships an update every 10 months, Stochastic Signal Processing every 5 weeks. The most recent releases landed on October 7, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | Noise Spectrum Logger | Stochastic Signal Processing |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/noise-spectrum-logger/id1153920486/reviews)** | [4.7 (6 ratings)](https://appshunter.io/ios/app/stochastic-signal-processing/id1450268179/reviews) |
| Number of ratings | 1 | **6** |
| Positive reviews | — | 66.7% of reviews |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 10 months | **Every 5 weeks** |
| Monetization | Free | Free |
| Size | 5 MB | 73 MB |
| Requires iOS | 15.5 | **15.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 12+ | 4+ |
| Developer | [Yukiko Iwai](https://appshunter.io/developer/965630131) | [Ian Young](https://appshunter.io/developer/1450268178) |

## 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 |


### Stochastic Signal Processing

[App page](https://appshunter.io/ios/app/stochastic-signal-processing/id1450268179)

Explore the processing of random signals like speech, music, and climate data. This interactive textbook offers dynamic information, films, animations, and 59 real-time laboratory experiments using your device's camera and microphone. It's designed for those with prior signal processing and probability theory knowledge.

**Highlights:** Interactive textbook format, Dynamic information display, Films and animations, 59 laboratory experiments, Real-time signal processing, Homework problems

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

**In-app purchases:** none


## Frequently asked questions

### Is Noise Spectrum Logger free?

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

### Is Stochastic Signal Processing free?

Stochastic Signal Processing is free to download, with no in-app purchases.

### Which has better reviews, Noise Spectrum Logger or Stochastic Signal Processing?

Noise Spectrum Logger is rated higher. Noise Spectrum Logger averages 5.0 out of 5 from 1 ratings, while Stochastic Signal Processing averages 4.7 from 6 ratings.

### Do Noise Spectrum Logger or Stochastic Signal Processing have ads?

Neither Noise Spectrum Logger nor Stochastic Signal Processing shows ads.

### Which is updated more often, Noise Spectrum Logger or Stochastic Signal Processing?

Noise Spectrum Logger ships an update every 10 months, and Stochastic Signal Processing every 5 weeks. Most recently, Noise Spectrum Logger was updated on October 7, 2026 and Stochastic Signal Processing on October 24, 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.*