# BladderUSG vs SmartVUS zn

The clearest difference is update cadence: SmartVUS zn at every 2 months against BladderUSG's every 5 months. BladderUSG'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.

BladderUSG ships an update every 5 months, SmartVUS zn every 2 months. The most recent releases landed on September 20, 2026 and September 25, 2026 respectively.

## The numbers

| Metric | BladderUSG | SmartVUS zn |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 5 months | **Every 2 months** |
| Size | 11 MB | 9 MB |
| Requires iOS | **11.0** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 12+ | 4+ |
| Developer | [SonoStarMed](https://appshunter.io/developer/1113993886) | [SonopTek Co, Ltd.](https://appshunter.io/developer/1077612429) |

## What reviewers say

### BladderUSG

[App page](https://appshunter.io/ios/app/bladderusg/id1508441442)

**Features:** macOS Compatibility

**In-app purchases:** none


### SmartVUS zn

[App page](https://appshunter.io/ios/app/smartvus-zn/id1547566836)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is BladderUSG free?

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

### Is SmartVUS zn free?

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

### Do BladderUSG or SmartVUS zn have ads?

Neither BladderUSG nor SmartVUS zn shows ads.

### Which is updated more often, BladderUSG or SmartVUS zn?

BladderUSG ships an update every 5 months, and SmartVUS zn every 2 months. Most recently, BladderUSG was updated on September 20, 2026 and SmartVUS zn on September 25, 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.*