# S vs i

The clearest difference is update cadence: S at monthly against i's every 14 months. S also leads on rating (3.0 vs 2.7) and iOS requirement (6.0 vs 16.0). i's advantage is ratings volume (35 vs 2). On price, ads, in-app purchases and monetization model 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 2.7. That said, the two scores are not equally well evidenced: i has 35 ratings behind it against 2, so its average is the more settled of the two.

S ships an update monthly, i every 14 months. The most recent releases landed on September 19, 2026 and September 18, 2026 respectively.

## The numbers

| Metric | S | i |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[3.0 (2 ratings)](https://appshunter.io/ios/app/s-viewer/id824140331/reviews)** | [2.7 (35 ratings)](https://appshunter.io/ios/app/i-seeing/id926099814/reviews) |
| Number of ratings | 2 | **35** |
| Positive reviews | — | 20.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Monthly** | Every 14 months |
| Monetization | Free | Free |
| Size | 12 MB | 6 MB |
| Requires iOS | **6.0** | 16.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [TSUNG JUNG HU](https://appshunter.io/developer/588252161) | [Shanghai Qingying Electronic Technology LLC](https://appshunter.io/developer/926099802) |

## 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


### i

[App page](https://appshunter.io/ios/app/i-seeing/id926099814)

Transform your smartphone into a powerful magnification tool. Observe and record microscopic details with your phone's camera and a macro lens. Measure objects with a scale bar and add notes to your digital micrographs.

**Highlights:** Professional magnification tool, Record digital micrographs, Optical magnification, Up to 10x digital zoom, Scale bar for measurement, Add notes and remarks, Direct photo sharing

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is S free?

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

### Is i free?

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

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

S is rated higher. S averages 3.0 out of 5 from 2 ratings, while i averages 2.7 from 35 ratings.

### Do S or i have ads?

Neither S nor i shows ads.

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

S ships an update monthly, and i every 14 months. Most recently, S was updated on September 19, 2026 and i on September 18, 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.*