# DR.Lissajous vs Voice Spectrogram Logger

The clearest difference is review sentiment: DR.Lissajous at 50% against Voice Spectrogram Logger's 0%. DR.Lissajous also leads on rating (4.5 vs 1.0) and in-app purchases (none vs 1). On price, ratings volume, update cadence and ads there is nothing between them.

Both are free to download. Voice Spectrogram Logger sells 1 one-off in-app purchase. DR.Lissajous asks for nothing beyond the download.

DR.Lissajous holds the better App Store score, 4.5 against 1.0. Both are backed by a comparable volume of ratings — 2 and 1 respectively. Written reviews point the same way: 50% of DR.Lissajous's written reviews are positive against 0% of Voice Spectrogram Logger's.

DR.Lissajous ships an update every 23 months, Voice Spectrogram Logger every 15 months. The most recent releases landed on July 17, 2026 and July 29, 2026 respectively.

## The numbers

| Metric | DR.Lissajous | Voice Spectrogram Logger |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.5 (2 ratings)](https://appshunter.io/ios/app/drlissajous/id713543974/reviews)** | [1.0 (1 ratings)](https://appshunter.io/ios/app/voice-spectrogram-logger/id1277134462/reviews) |
| Number of ratings | **2** | 1 |
| Positive reviews | **50.0% of reviews** | 0.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 23 months | **Every 15 months** |
| Monetization | Free | Free |
| Size | 41 MB | 7 MB |
| Requires iOS | **9.1** | 15.5 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 12+ |
| Developer | [Daniel Roth](https://appshunter.io/developer/356650850) | [Yukiko Iwai](https://appshunter.io/developer/965630131) |

## What reviewers say

### DR.Lissajous

[App page](https://appshunter.io/ios/app/drlissajous/id713543974)

Explore the visual patterns created by combining horizontal and vertical electron beam movements. Manipulate amplitudes, frequencies, and phase differences to generate unique spirograph-like curves on your screen.

**Highlights:** Create Lissajous curves, Simulate electron beam motion, Adjust amplitudes, Modify frequencies, Change phase difference, Generate spirograph patterns

**Features:** macOS Compatibility

**In-app purchases:** none


### Voice Spectrogram Logger

[App page](https://appshunter.io/ios/app/voice-spectrogram-logger/id1277134462)

Visualize voice frequencies in a spectrogram from 20-2500Hz. Adjust display with sliders and log recordings to export as PNG files. Functions fully offline and supports background processing.

**Highlights:** 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

**Features:** macOS Compatibility

**In-app purchases (1)**

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


## Frequently asked questions

### Is DR.Lissajous free?

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

### Is Voice Spectrogram Logger free?

Voice Spectrogram Logger is free to download, with in-app purchases available.

### Which has better reviews, DR.Lissajous or Voice Spectrogram Logger?

DR.Lissajous is rated higher. DR.Lissajous averages 4.5 out of 5 from 2 ratings, while Voice Spectrogram Logger averages 1.0 from 1 ratings.

### Do DR.Lissajous or Voice Spectrogram Logger have ads?

Neither DR.Lissajous nor Voice Spectrogram Logger shows ads.

### Which is updated more often, DR.Lissajous or Voice Spectrogram Logger?

DR.Lissajous ships an update every 23 months, and Voice Spectrogram Logger every 15 months. Most recently, DR.Lissajous was updated on July 17, 2026 and Voice Spectrogram Logger on July 29, 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.*