# Voice Spectrogram Logger vs Morse Code

The clearest difference is review sentiment: Morse Code at 67% against Voice Spectrogram Logger's 0%. Morse Code also leads on rating (4.6 vs 1.0) and update cadence (every 5 days vs every 15 months). Voice Spectrogram Logger's advantage is monetization model (free vs free with in-app purchases). On price, ads, in-app purchases and iOS requirement there is nothing between them.

Both are free to download. Voice Spectrogram Logger sells 1 one-off in-app purchase and Morse Code sells 4 in-app purchases, starting at $0.99 per month. Whichever you choose, the download price is not the number that matters.

Morse Code holds the better App Store score, 4.6 against 1.0. That said, the two scores are not equally well evidenced: Morse Code has 237 ratings behind it against 1, so its average is the more settled of the two. Written reviews point the same way: 0% of Voice Spectrogram Logger's written reviews are positive against 67% of Morse Code's.

Voice Spectrogram Logger ships an update every 15 months, Morse Code every 5 days. The most recent releases landed on July 29, 2026 and September 23, 2026 respectively.

## The numbers

| Metric | Voice Spectrogram Logger | Morse Code |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [1.0 (1 ratings)](https://appshunter.io/ios/app/voice-spectrogram-logger/id1277134462/reviews) | **[4.6 (237 ratings)](https://appshunter.io/ios/app/morse-code-morse-master/id1664039661/reviews)** |
| Number of ratings | 1 | **237** |
| Positive reviews | 0.0% of reviews | **66.7% of reviews** |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 15 months | **Every 5 days** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 7 MB | 45 MB |
| Requires iOS | 15.5 | **15.0** |
| Devices | iPhone, iPad, iPod | **iPhone, iPad, iPod, Mac, Apple Watch** |
| Age rating | 12+ | 4+ |
| Developer | [Yukiko Iwai](https://appshunter.io/developer/965630131) | [亚娟 秦](https://appshunter.io/developer/1539395142) |

## What reviewers say

### 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 |


### Morse Code

[App page](https://appshunter.io/ios/app/morse-code-morse-master/id1664039661)

Learn and master Morse code with this app. It features AI-powered audio decoding, interactive practice games, and a comprehensive code table. Customize your learning experience and track your progress.

**Highlights:** AI audio decoding, Practice games, Morse code table, Bidirectional translation, Customizable settings, Progress tracking

**Features:** Apple Watch app, Vision Pro support

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Morse Master PRO Monthly | $0.99 | per month |
| Morse Master PRO Annual | $2.99 | per year |
| Unlock full version | $0.99 | one-time |
| Morse Master PRO Lifetime | $3.99 | one-time |


## Frequently asked questions

### Is Voice Spectrogram Logger free?

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

### Is Morse Code free?

Morse Code is free to download, with in-app purchases available.

### Which has better reviews, Voice Spectrogram Logger or Morse Code?

Morse Code is rated higher. Voice Spectrogram Logger averages 1.0 out of 5 from 1 ratings, while Morse Code averages 4.6 from 237 ratings.

### Do Voice Spectrogram Logger or Morse Code have ads?

Neither Voice Spectrogram Logger nor Morse Code shows ads.

### Which is updated more often, Voice Spectrogram Logger or Morse Code?

Voice Spectrogram Logger ships an update every 15 months, and Morse Code every 5 days. Most recently, Voice Spectrogram Logger was updated on July 29, 2026 and Morse Code on September 23, 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.*