# Wavelet Voice Sonogram vs Sound

The clearest difference is price: Sound at Free against Wavelet Voice Sonogram's $6.99. Sound also leads on update cadence (every 2 weeks vs every 8 months) and device support (3 vs 1). Wavelet Voice Sonogram's advantage is ads (none vs shown). On in-app purchases there is nothing between them.

Sound is free to download; Wavelet Voice Sonogram costs $6.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Wavelet Voice Sonogram ships an update every 8 months, Sound every 2 weeks. The most recent releases landed on September 9, 2026 and September 14, 2026 respectively.

## The numbers

| Metric | Wavelet Voice Sonogram | Sound |
| --- | --- | --- |
| Price | $6.99 | **Free** |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | Every 8 months | **Every 2 weeks** |
| Size | 0 MB | 36 MB |
| Requires iOS | 26.2 | **15.8.3** |
| Devices | iPhone | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [TOON,LLC](https://appshunter.io/developer/633948723) | [Hideaki Uchikoshi](https://appshunter.io/developer/1559575002) |

## What reviewers say

### Wavelet Voice Sonogram

[App page](https://appshunter.io/ios/app/wavelet-voice-sonogram/id1574131130)

**In-app purchases:** none


### Sound

[App page](https://appshunter.io/ios/app/sound-classification/id6504697264)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Wavelet Voice Sonogram free?

Wavelet Voice Sonogram costs $6.99, with no in-app purchases.

### Is Sound free?

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

### Do Wavelet Voice Sonogram or Sound have ads?

Sound shows ads; Wavelet Voice Sonogram does not.

### Which is updated more often, Wavelet Voice Sonogram or Sound?

Wavelet Voice Sonogram ships an update every 8 months, and Sound every 2 weeks. Most recently, Wavelet Voice Sonogram was updated on September 9, 2026 and Sound on September 14, 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.*