# PDF Scan Express vs Roll Call · Teacher Assistant

The clearest difference is in-app purchases: PDF Scan Express at none against Roll Call · Teacher Assistant's 1. Roll Call · Teacher Assistant's advantage is device support (3 vs 1) and iOS requirement (13.0 vs 17.5). On price and ads there is nothing between them.

Both are free to download. Roll Call · Teacher Assistant sells 1 one-off in-app purchase. PDF Scan Express asks for nothing beyond the download.

## The numbers

| Metric | PDF Scan Express | Roll Call · Teacher Assistant |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | — | Every 3 days |
| Size | 52 MB | 23 MB |
| Requires iOS | 17.5 | **13.0** |
| Devices | iPhone | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Leung Man Ho Thomas](https://appshunter.io/developer/619609289) | [申生 金](https://appshunter.io/developer/1527691180) |

## What reviewers say

### PDF Scan Express

[App page](https://appshunter.io/ios/app/pdf-scan-express/id6523436144)

**Features:** macOS Compatibility

**In-app purchases:** none


### Roll Call · Teacher Assistant

[App page](https://appshunter.io/ios/app/roll-call-teacher-assistant/id6759387869)

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 永久解锁 | $9.99 | one-time |


## Frequently asked questions

### Is PDF Scan Express free?

PDF Scan Express is free to download, with no in-app purchases.

### Is Roll Call · Teacher Assistant free?

Roll Call · Teacher Assistant is free to download, with in-app purchases available.

### Do PDF Scan Express or Roll Call · Teacher Assistant have ads?

Neither PDF Scan Express nor Roll Call · Teacher Assistant shows ads.

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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.*