# CiiMS SOS vs Sound

The clearest difference is ads: CiiMS SOS at none against Sound's shown. Sound's advantage is update cadence (every 2 weeks vs every 2 months). On price, in-app purchases, device support and iOS requirement there is nothing between them.

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

CiiMS SOS ships an update every 2 months, Sound every 2 weeks. The most recent releases landed on October 3, 2026 and October 2, 2026 respectively.

## The numbers

| Metric | CiiMS SOS | Sound |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | Every 2 months | **Every 2 weeks** |
| Size | 111 MB | 36 MB |
| Requires iOS | **15.6** | 15.8.3 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [SOS-ICT (PTY) LTD](https://appshunter.io/developer/1520000687) | [Hideaki Uchikoshi](https://appshunter.io/developer/1559575002) |

## What reviewers say

### CiiMS SOS

[App page](https://appshunter.io/ios/app/ciims-sos/id1467876738)

**Features:** macOS Compatibility

**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 CiiMS SOS free?

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

### Is Sound free?

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

### Do CiiMS SOS or Sound have ads?

Sound shows ads; CiiMS SOS does not.

### Which is updated more often, CiiMS SOS or Sound?

CiiMS SOS ships an update every 2 months, and Sound every 2 weeks. Most recently, CiiMS SOS was updated on October 3, 2026 and Sound on October 2, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*