# BTR_OCC vs System Sound

The clearest difference is ads: BTR_OCC at none against System Sound's shown. BTR_OCC also leads on iOS requirement (12.0 vs 15.8.3). System Sound's advantage is update cadence (every 2 weeks vs every 2 months). On price, 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.

BTR_OCC ships an update every 2 months, System Sound every 2 weeks. The most recent releases landed on September 29, 2026 and October 3, 2026 respectively.

## The numbers

| Metric | BTR_OCC | System Sound |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | Every 2 months | **Every 2 weeks** |
| Size | 15 MB | 36 MB |
| Requires iOS | **12.0** | 15.8.3 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [acv](https://appshunter.io/developer/1240641582) | [Hideaki Uchikoshi](https://appshunter.io/developer/1559575002) |

## What reviewers say

### BTR_OCC

[App page](https://appshunter.io/ios/app/btr-occ/id1407539259)

**Features:** macOS Compatibility

**In-app purchases:** none


### System Sound

[App page](https://appshunter.io/ios/app/system-sound/id6504702118)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is BTR_OCC free?

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

### Is System Sound free?

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

### Do BTR_OCC or System Sound have ads?

System Sound shows ads; BTR_OCC does not.

### Which is updated more often, BTR_OCC or System Sound?

BTR_OCC ships an update every 2 months, and System Sound every 2 weeks. Most recently, BTR_OCC was updated on September 29, 2026 and System Sound on October 3, 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.*