# Rotor Engine vs PDF

The clearest difference is in-app purchases: Rotor Engine at none against PDF's 3. Rotor Engine also leads on ads (none vs shown) and iOS requirement (10.0 vs 13.0). On price and device support there is nothing between them.

Both are free to download. PDF sells 3 in-app purchases, starting at $1.99 per 7 days. Rotor Engine asks for nothing beyond the download.

## The numbers

| Metric | Rotor Engine | PDF |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Size | 6 MB | 12 MB |
| Requires iOS | **10.0** | 13.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Hublot SA](https://appshunter.io/developer/396904336) | [Ashvin Kevadiya](https://appshunter.io/developer/1798640399) |

## What reviewers say

### Rotor Engine

[App page](https://appshunter.io/ios/app/rotor-engine/id1498187557)

**Features:** macOS Compatibility

**In-app purchases:** none


### PDF

[App page](https://appshunter.io/ios/app/pdf-smart-compress-and-resize/id6747057935)

**Features:** macOS Compatibility

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Compress Resize weekly Premium | $1.99 | per 7 days |
| Compress Resize Month Premium | $5.99 | per month |
| Compress Resize Yearly Premium | $39.99 | per year |


## Frequently asked questions

### Is Rotor Engine free?

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

### Is PDF free?

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

### Do Rotor Engine or PDF have ads?

PDF shows ads; Rotor Engine 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.*