# Sound vs Wattstopperi3

The clearest difference is ads: Wattstopperi3 at none against Sound's shown. On price, update cadence, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Sound ships an update every 2 weeks, Wattstopperi3 every 4 weeks. The most recent releases landed on September 14, 2026 and September 28, 2026 respectively.

## The numbers

| Metric | Sound | Wattstopperi3 |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | Yes | **No** |
| Update frequency | **Every 2 weeks** | Every 4 weeks |
| Size | 36 MB | 80 MB |
| Requires iOS | 15.8.3 | **15.6** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Hideaki Uchikoshi](https://appshunter.io/developer/1559575002) | [THE WATT STOPPER, INC.](https://appshunter.io/developer/1188479609) |

## What reviewers say

### Sound

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

**Features:** macOS Compatibility

**In-app purchases:** none


### Wattstopperi3

[App page](https://appshunter.io/ios/app/wattstopperi3/id6745227707)

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

**In-app purchases:** none


## Frequently asked questions

### Is Sound free?

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

### Is Wattstopperi3 free?

Wattstopperi3 is free to download, with no in-app purchases.

### Do Sound or Wattstopperi3 have ads?

Sound shows ads; Wattstopperi3 does not.

### Which is updated more often, Sound or Wattstopperi3?

Sound ships an update every 2 weeks, and Wattstopperi3 every 4 weeks. Most recently, Sound was updated on September 14, 2026 and Wattstopperi3 on September 28, 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.*