# Rotor Engine vs StampDoc

The clearest difference is iOS requirement: Rotor Engine at 10.0 against StampDoc's 15. On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

## The numbers

| Metric | Rotor Engine | StampDoc |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/stampdoc/id6753040013/reviews)** |
| Number of ratings | — | **1** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | — | Every 2 months |
| Monetization | — | Free |
| Size | 6 MB | 67 MB |
| Requires iOS | **10.0** | 15 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Hublot SA](https://appshunter.io/developer/396904336) | [Anyelo Moreno](https://appshunter.io/developer/1842233376) |

## What reviewers say

### Rotor Engine

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

**Features:** macOS Compatibility

**In-app purchases:** none


### StampDoc

[App page](https://appshunter.io/ios/app/stampdoc/id6753040013)

Easily sign PDFs and images, create custom digital stamps, and manage your documents securely from your iPhone or iPad. Streamline your workflow by going fully digital, eliminating the need for printing and scanning.

**Highlights:** Sign PDFs and images, Create custom digital stamps, Signature editor and scanner, Import and reuse stamps, Built-in PDF and image viewer, Save and share signed files

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Rotor Engine free?

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

### Is StampDoc free?

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

### Do Rotor Engine or StampDoc have ads?

Neither Rotor Engine nor StampDoc 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.*