# Lambda Shield vs PDFlyer

The clearest difference is in-app purchases: Lambda Shield at none against PDFlyer's 2. Lambda Shield also leads on ads (none vs shown) and iOS requirement (13.0 vs 16). On price and device support there is nothing between them.

Both are free to download. PDFlyer sells 2 in-app purchases, starting at $4.99 per 7 days. Lambda Shield asks for nothing beyond the download.

## The numbers

| Metric | Lambda Shield | PDFlyer |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Size | 1 MB | 26 MB |
| Requires iOS | **13.0** | 16 |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Bylund Automotive AB](https://appshunter.io/developer/1501303747) | [Hangzhou View Creativity Technology Co., Ltd.](https://appshunter.io/developer/1767072925) |

## What reviewers say

### Lambda Shield

[App page](https://appshunter.io/ios/app/lambda-shield/id1501303748)

**Features:** macOS Compatibility

**In-app purchases:** none


### PDFlyer

[App page](https://appshunter.io/ios/app/pdflyer-scan-to-pdf-and-sign/id6756166644)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| PDFlyer weekly Pro | $4.99 | per 7 days |
| PDFlyer yearly Pro | $29.99 | per year |


## Frequently asked questions

### Is Lambda Shield free?

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

### Is PDFlyer free?

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

### Do Lambda Shield or PDFlyer have ads?

PDFlyer shows ads; Lambda Shield does not.

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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.*