# WirelessUSG Flash vs Cold Knee Massager

The clearest difference is iOS requirement: Cold Knee Massager at 13.0 against WirelessUSG Flash's 15.0. On price, update cadence, ads and in-app purchases there is nothing between them.

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

WirelessUSG Flash ships an update monthly, Cold Knee Massager every 3 weeks. The most recent releases landed on October 24, 2026 and October 9, 2026 respectively.

## The numbers

| Metric | WirelessUSG Flash | Cold Knee Massager |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[2.3 (12 ratings)](https://appshunter.io/ios/app/wirelessusg-flash/id1548235287/reviews)** | — |
| Number of ratings | **12** | — |
| Positive reviews | 14.3% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Monthly | **Every 3 weeks** |
| Monetization | Free | — |
| Size | 22 MB | 33 MB |
| Requires iOS | 15.0 | **13.0** |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 12+ | 4+ |
| Developer | [SonoStarMed](https://appshunter.io/developer/1113993886) | [海洋 刘](https://appshunter.io/developer/1736870190) |

## What reviewers say

### WirelessUSG Flash

[App page](https://appshunter.io/ios/app/wirelessusg-flash/id1548235287)

This application displays ultrasound images for reference. It is important to note that it does not provide medical advice and users should consult a physician for diagnosis or treatment.

**Highlights:** Ultrasound image display, Reference imaging, Disclaimer for medical use

**Features:** macOS Compatibility

**In-app purchases:** none


### Cold Knee Massager

[App page](https://appshunter.io/ios/app/cold-knee-massager/id6770961174)

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

**In-app purchases:** none


## Frequently asked questions

### Is WirelessUSG Flash free?

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

### Is Cold Knee Massager free?

Cold Knee Massager is free to download, with no in-app purchases.

### Do WirelessUSG Flash or Cold Knee Massager have ads?

Neither WirelessUSG Flash nor Cold Knee Massager shows ads.

### Which is updated more often, WirelessUSG Flash or Cold Knee Massager?

WirelessUSG Flash ships an update monthly, and Cold Knee Massager every 3 weeks. Most recently, WirelessUSG Flash was updated on October 24, 2026 and Cold Knee Massager on October 9, 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.*