# S vs USB

The clearest difference is rating: S at 3.0 against USB's 2.0. S also leads on iOS requirement (6.0 vs 13.0). USB's advantage is ratings volume (29 vs 2). 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.

S holds the better App Store score, 3.0 against 2.0. That said, the two scores are not equally well evidenced: USB has 29 ratings behind it against 2, so its average is the more settled of the two.

S ships an update monthly, USB every 5 weeks. The most recent releases landed on September 19, 2026 and October 6, 2026 respectively.

## The numbers

| Metric | S | USB |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[3.0 (2 ratings)](https://appshunter.io/ios/app/s-viewer/id824140331/reviews)** | [2.0 (29 ratings)](https://appshunter.io/ios/app/usb-view/id1404195213/reviews) |
| Number of ratings | 2 | **29** |
| Positive reviews | — | 18.2% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Monthly** | Every 5 weeks |
| Monetization | Free | Free |
| Size | 12 MB | 8 MB |
| Requires iOS | **6.0** | 13.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [TSUNG JUNG HU](https://appshunter.io/developer/588252161) | [志强 童](https://appshunter.io/developer/1214909933) |

## What reviewers say

### S

[App page](https://appshunter.io/ios/app/s-viewer/id824140331)

This app allows you to view live images from a USB camera connected to a WiFi station wirelessly. You can capture, record, freeze, and annotate the video feed, and even switch to your iOS device's camera.

**Highlights:** Wireless USB camera transfer, Live image preview, Capture and record video, Freeze and draw on video, Switch camera resolutions, Adjust image quality (brightness), Use iOS device camera

**Features:** macOS Compatibility

**In-app purchases:** none


### USB

[App page](https://appshunter.io/ios/app/usb-view/id1404195213)

This application connects to WIFI image transmission equipment, enabling wireless image data transfer between cameras and iOS devices. It allows for real-time, free transmission of visuals from anywhere, anytime.

**Highlights:** WIFI image transmission, Wireless connection to iOS devices, Real-time image data transfer, Anytime, anywhere access, Free wireless transmission

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

**In-app purchases:** none


## Frequently asked questions

### Is S free?

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

### Is USB free?

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

### Which has better reviews, S or USB?

S is rated higher. S averages 3.0 out of 5 from 2 ratings, while USB averages 2.0 from 29 ratings.

### Do S or USB have ads?

Neither S nor USB shows ads.

### Which is updated more often, S or USB?

S ships an update monthly, and USB every 5 weeks. Most recently, S was updated on September 19, 2026 and USB on October 6, 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.*