# Project Avicenna vs Deck 21

The clearest difference is iOS requirement: Deck 21 at 12.0 against Project Avicenna's 15.1. 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 | Project Avicenna | Deck 21 |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | — | Daily |
| Size | 13 MB | 74 MB |
| Requires iOS | 15.1 | **12.0** |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Seif Elfayoumy](https://appshunter.io/developer/1578013309) | [Andre Salvador](https://appshunter.io/developer/1584863518) |

## What reviewers say

### Project Avicenna

[App page](https://appshunter.io/ios/app/project-avicenna-memory-tiles/id6737483183)

**Features:** macOS Compatibility

**In-app purchases:** none


### Deck 21

[App page](https://appshunter.io/ios/app/deck-21/id6743880049)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Project Avicenna free?

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

### Is Deck 21 free?

Deck 21 is free to download, with no in-app purchases.

### Do Project Avicenna or Deck 21 have ads?

Neither Project Avicenna nor Deck 21 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.*