# SJI vs EMF Scan

The clearest difference is in-app purchases: SJI at none against EMF Scan's 1. SJI also leads on ads (none vs shown). EMF Scan's advantage is iOS requirement (13.0 vs 15.0). On price, update cadence and device support there is nothing between them.

Both are free to download. EMF Scan sells 1 one-off in-app purchase. SJI asks for nothing beyond the download.

SJI ships an update every 2 weeks, EMF Scan weekly. Both last shipped on September 10, 2026.

## The numbers

| Metric | SJI | EMF Scan |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 2 weeks | **Weekly** |
| Size | 1 MB | 29 MB |
| Requires iOS | 15.0 | **13.0** |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [SJI Co.,Ltd](https://appshunter.io/developer/1673658795) | [Yasuhiro Kodama](https://appshunter.io/developer/1895805086) |

## What reviewers say

### SJI

[App page](https://appshunter.io/ios/app/sji-uwbapplication/id1673674516)

**Features:** macOS Compatibility

**In-app purchases:** none


### EMF Scan

[App page](https://appshunter.io/ios/app/emf-scan/id6770155541)

**Features:** Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 広告を削除 | $0.99 | one-time |


## Frequently asked questions

### Is SJI free?

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

### Is EMF Scan free?

EMF Scan is free to download, with in-app purchases available.

### Do SJI or EMF Scan have ads?

EMF Scan shows ads; SJI does not.

### Which is updated more often, SJI or EMF Scan?

SJI ships an update every 2 weeks, and EMF Scan weekly. Most recently, SJI was updated on September 10, 2026 and EMF Scan on September 10, 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.*