# Cartesius vs 9

The clearest difference is in-app purchases: Cartesius at none against 9's 1. Cartesius also leads on ads (none vs shown). On price, update cadence, device support and iOS requirement there is nothing between them.

Both are free to download. 9 sells 1 one-off in-app purchase. Cartesius asks for nothing beyond the download.

Cartesius ships an update every 2 months, 9 every 5 weeks. The most recent releases landed on October 19, 2026 and October 5, 2026 respectively.

## The numbers

| Metric | Cartesius | 9 |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 2 months | **Every 5 weeks** |
| Size | 44 MB | 26 MB |
| Requires iOS | 15.1 | **14.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Infowijs B.V.](https://appshunter.io/developer/1499461770) | [Okko Meijer](https://appshunter.io/developer/1881299592) |

## What reviewers say

### Cartesius

[App page](https://appshunter.io/ios/app/cartesius/id1578440107)

**In-app purchases:** none


### 9

[App page](https://appshunter.io/ios/app/9-box/id6761386274)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Verwijder advertenties | $2.99 | one-time |


## Frequently asked questions

### Is Cartesius free?

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

### Is 9 free?

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

### Do Cartesius or 9 have ads?

9 shows ads; Cartesius does not.

### Which is updated more often, Cartesius or 9?

Cartesius ships an update every 2 months, and 9 every 5 weeks. Most recently, Cartesius was updated on October 19, 2026 and 9 on October 5, 2026.

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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.*