# QuantumPass vs Simple Diagram

The clearest difference is in-app purchases: Simple Diagram at none against QuantumPass's 3. QuantumPass's advantage is ads (none vs shown). On price, device support and iOS requirement there is nothing between them.

Both are free to download. QuantumPass sells 3 one-off in-app purchases. Simple Diagram asks for nothing beyond the download.

## The numbers

| Metric | QuantumPass | Simple Diagram |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | **No** | Yes |
| Update frequency | Every 10 months | — |
| Size | 3 MB | 4 MB |
| Requires iOS | **17.6** | 18.4 |
| Devices | iPhone, iPad, Mac | iPhone, iPad, Mac |
| Age rating | 4+ | 4+ |
| Developer | [Valerie Otero](https://appshunter.io/developer/1848585337) | [Nhat Linh Dang](https://appshunter.io/developer/1857899120) |

## What reviewers say

### QuantumPass

[App page](https://appshunter.io/ios/app/quantumpass/id6755789663)

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Small coffee | $1.99 | one-time |
| Medium coffee | $3.99 | one-time |
| Large coffee | $5.99 | one-time |


### Simple Diagram

[App page](https://appshunter.io/ios/app/simple-diagram/id6757369392)

**Features:** Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is QuantumPass free?

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

### Is Simple Diagram free?

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

### Do QuantumPass or Simple Diagram have ads?

Simple Diagram shows ads; QuantumPass 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.*