# System Designer vs ArchFlowy

The clearest difference is in-app purchases: System Designer at none against ArchFlowy's 1. System Designer also leads on iOS requirement (15.6 vs 18.2). ArchFlowy's advantage is update cadence (every 2 weeks vs monthly). On price, ads and device support there is nothing between them.

Both are free to download. ArchFlowy sells 1 in-app purchase, starting at $1.99 per month. System Designer asks for nothing beyond the download.

System Designer ships an update monthly, ArchFlowy every 2 weeks. The most recent releases landed on September 18, 2026 and September 10, 2026 respectively.

## The numbers

| Metric | System Designer | ArchFlowy |
| --- | --- | --- |
| 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 | 3 MB |
| Requires iOS | **15.6** | 18.2 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Erwan Carriou](https://appshunter.io/developer/1102494853) | [Timmy Nguyen](https://appshunter.io/developer/1725059991) |

## 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


### ArchFlowy

[App page](https://appshunter.io/ios/app/archflowy/id6757314902)

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly Subscription | $1.99 | per month |


## Frequently asked questions

### Is System Designer free?

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

### Is ArchFlowy free?

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

### Do System Designer or ArchFlowy have ads?

Neither System Designer nor ArchFlowy shows ads.

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

System Designer ships an update monthly, and ArchFlowy every 2 weeks. Most recently, System Designer was updated on September 18, 2026 and ArchFlowy on September 10, 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.*