# Smart Guardian vs Protect PDF

The clearest difference is in-app purchases: Smart Guardian at none against Protect PDF's 1. Smart Guardian also leads on iOS requirement (11.0 vs 17.6). Protect PDF's advantage is device support. On price there is nothing between them.

Both are free to download. Protect PDF sells 1 one-off in-app purchase. Smart Guardian asks for nothing beyond the download.

## The numbers

| Metric | Smart Guardian | Protect PDF |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | — | No |
| Size | 93 MB | 16 MB |
| Requires iOS | **11.0** | 17.6 |
| Devices | — | **iPhone, iPad** |
| Age rating | 4+ | 4+ |
| Developer | [SMART KIDS TECHNOLOGIES](https://appshunter.io/developer/1715453768) | [Antonio Gonzalez de la aleja german](https://appshunter.io/developer/1839645711) |

## What reviewers say

### Smart Guardian

[App page](https://appshunter.io/ios/app/smart-guardian/id6471486097)

**In-app purchases:** none


### Protect PDF

[App page](https://appshunter.io/ios/app/protect-pdf-password-lock/id6771690647)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove Ads | $2.99 | one-time |


## Frequently asked questions

### Is Smart Guardian free?

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

### Is Protect PDF free?

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

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*