# SONO USG vs CMS1600

The clearest difference is update cadence: SONO USG at every 3 weeks against CMS1600's every 9 months. CMS1600's advantage is iOS requirement (11.0 vs 15.0). On price, ads, 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.

SONO USG ships an update every 3 weeks, CMS1600 every 9 months. The most recent releases landed on November 7, 2026 and November 4, 2026 respectively.

## The numbers

| Metric | SONO USG | CMS1600 |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 3 weeks** | Every 9 months |
| Size | 276 MB | 7 MB |
| Requires iOS | 15.0 | **11.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 12+ | 17+ |
| Developer | [Leltek](https://appshunter.io/developer/1329395835) | [Contec Medical Systems Co., Ltd.](https://appshunter.io/developer/908936493) |

## What reviewers say

### SONO USG

[App page](https://appshunter.io/ios/app/sono-usg/id1671961635)

**Features:** macOS Compatibility

**In-app purchases:** none


### CMS1600

[App page](https://appshunter.io/ios/app/cms1600-vet/id6474657919)

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

**In-app purchases:** none


## Frequently asked questions

### Is SONO USG free?

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

### Is CMS1600 free?

CMS1600 is free to download, with no in-app purchases.

### Do SONO USG or CMS1600 have ads?

Neither SONO USG nor CMS1600 shows ads.

### Which is updated more often, SONO USG or CMS1600?

SONO USG ships an update every 3 weeks, and CMS1600 every 9 months. Most recently, SONO USG was updated on November 7, 2026 and CMS1600 on November 4, 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.*