# BladderUSG Pro vs CMS1600

The clearest difference is update cadence: BladderUSG Pro at monthly against CMS1600's every 9 months. 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.

BladderUSG Pro ships an update monthly, CMS1600 every 9 months. The most recent releases landed on September 9, 2026 and August 20, 2026 respectively.

## The numbers

| Metric | BladderUSG Pro | CMS1600 |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Monthly** | Every 9 months |
| Size | 47 MB | 7 MB |
| Requires iOS | 12.0 | **11.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 17+ |
| Developer | [SonoStarMed](https://appshunter.io/developer/1113993886) | [Contec Medical Systems Co., Ltd.](https://appshunter.io/developer/908936493) |

## What reviewers say

### BladderUSG Pro

[App page](https://appshunter.io/ios/app/bladderusg-pro/id6450775928)

**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 BladderUSG Pro free?

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

### Is CMS1600 free?

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

### Do BladderUSG Pro or CMS1600 have ads?

Neither BladderUSG Pro nor CMS1600 shows ads.

### Which is updated more often, BladderUSG Pro or CMS1600?

BladderUSG Pro ships an update monthly, and CMS1600 every 9 months. Most recently, BladderUSG Pro was updated on September 9, 2026 and CMS1600 on August 20, 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.*