# System Designer vs Clarity.Do

The clearest difference is in-app purchases: System Designer at none against Clarity.Do's 4. System Designer also leads on iOS requirement (15.6 vs 18.0). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. Clarity.Do sells 4 in-app purchases, starting at $0.99 per month. System Designer asks for nothing beyond the download.

System Designer ships an update monthly, Clarity.Do every 2 weeks. The most recent releases landed on October 23, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | System Designer | Clarity.Do |
| --- | --- | --- |
| 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 2 weeks** |
| Monetization | Free | — |
| Size | 7 MB | 10 MB |
| Requires iOS | **15.6** | 18.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, Mac |
| Age rating | 4+ | 4+ |
| Developer | [Erwan Carriou](https://appshunter.io/developer/1102494853) | [Clarity.Do LLC](https://appshunter.io/developer/1894732514) |

## 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


### Clarity.Do

[App page](https://appshunter.io/ios/app/claritydo/id6767397720)

**Features:** Vision Pro support

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Clarity.Do Pro Monthly | $0.99 | per month |
| Clarity.Do Premium Monthly | $4.99 | per month |
| Clarity.Do Pro Yearly | $9.99 | per year |
| Clarity.Do Premium Yearly | $49.99 | per year |


## Frequently asked questions

### Is System Designer free?

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

### Is Clarity.Do free?

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

### Do System Designer or Clarity.Do have ads?

Neither System Designer nor Clarity.Do shows ads.

### Which is updated more often, System Designer or Clarity.Do?

System Designer ships an update monthly, and Clarity.Do every 2 weeks. Most recently, System Designer was updated on October 23, 2026 and Clarity.Do on October 24, 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.*