# System Designer vs Contentos

The clearest difference is in-app purchases: System Designer at none against Contentos's 2. System Designer also leads on device support (3 vs 1). On price, update cadence, ads and iOS requirement there is nothing between them.

Both are free to download. Contentos sells 2 in-app purchases, starting at $9.99 per month. System Designer asks for nothing beyond the download.

System Designer ships an update monthly, Contentos every 3 weeks. The most recent releases landed on October 23, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | System Designer | Contentos |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.4 (17 ratings)](https://appshunter.io/ios/app/system-designer/id1132983280/reviews)** | — |
| Number of ratings | **17** | — |
| Positive reviews | 77.8% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Monthly | **Every 3 weeks** |
| Monetization | Free | — |
| Size | 7 MB | 4 MB |
| Requires iOS | **15.6** | 16.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Erwan Carriou](https://appshunter.io/developer/1102494853) | [DJIONI DEV](https://appshunter.io/developer/1586148736) |

## What reviewers say

### System Designer

[App page](https://appshunter.io/ios/app/system-designer/id1132983280)

Design complex systems using a low-code platform that leverages UML standards. Generate code skeletons and manage components graphically. Run and test your system with dynamic type checking.

**Highlights:** UML-based system modeling, Code skeleton generation, Graphical component creation, MSON format for model definition, Dynamic type checking, Cross-device synchronization via GitHub

**Features:** macOS Compatibility

**In-app purchases:** none


### Contentos

[App page](https://appshunter.io/ios/app/contentos-viral-ai-content/id6782459518)

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Creator Monthly | $9.99 | per month |
| Creator Annual | $71.99 | per year |


## Frequently asked questions

### Is System Designer free?

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

### Is Contentos free?

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

### Do System Designer or Contentos have ads?

Neither System Designer nor Contentos shows ads.

### Which is updated more often, System Designer or Contentos?

System Designer ships an update monthly, and Contentos every 3 weeks. Most recently, System Designer was updated on October 23, 2026 and Contentos on October 31, 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.*