# BladderUSG vs Readius

The clearest difference is update cadence: Readius at every 2 months against BladderUSG's every 5 months. BladderUSG's advantage is iOS requirement (11.0 vs 14). 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, Readius every 2 months. The most recent releases landed on October 25, 2026 and October 27, 2026 respectively.

## The numbers

| Metric | BladderUSG | Readius |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 5 months | **Every 2 months** |
| Size | 11 MB | 418 MB |
| Requires iOS | **11.0** | 14 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 12+ | 17+ |
| Developer | [SonoStarMed](https://appshunter.io/developer/1113993886) | [Shantou Institute of Ultrasonic Inst. Co., Ltd.](https://appshunter.io/developer/406261738) |

## What reviewers say

### BladderUSG

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

**Features:** macOS Compatibility

**In-app purchases:** none


### Readius

[App page](https://appshunter.io/ios/app/readius/id6443592437)

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

**In-app purchases:** none


## Frequently asked questions

### Is BladderUSG free?

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

### Is Readius free?

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

### Do BladderUSG or Readius have ads?

Neither BladderUSG nor Readius shows ads.

### Which is updated more often, BladderUSG or Readius?

BladderUSG ships an update every 5 months, and Readius every 2 months. Most recently, BladderUSG was updated on October 25, 2026 and Readius on October 27, 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.*