# System Designer vs Diagrams Notepad 3

The clearest difference is rating: System Designer at 4.4 against Diagrams Notepad 3's 3.5. System Designer also leads on review sentiment (78% vs 39%) and in-app purchases (none vs 1). Diagrams Notepad 3's advantage is ratings volume (51 vs 17). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. Diagrams Notepad 3 sells 1 one-off in-app purchase. System Designer asks for nothing beyond the download.

System Designer holds the better App Store score, 4.4 against 3.5. Both are backed by a comparable volume of ratings — 17 and 51 respectively. Written reviews point the same way: 78% of System Designer's written reviews are positive against 39% of Diagrams Notepad 3's.

Both ship on a similar rhythm, roughly monthly. The most recent releases landed on September 18, 2026 and June 9, 2026 respectively.

## The numbers

| Metric | System Designer | Diagrams Notepad 3 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.4 (17 ratings)](https://appshunter.io/ios/app/system-designer/id1132983280/reviews)** | [3.5 (51 ratings)](https://appshunter.io/ios/app/diagrams-notepad-3/id1387425355/reviews) |
| Number of ratings | 17 | **51** |
| Positive reviews | **77.8% of reviews** | 39.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Monthly | Monthly |
| Monetization | **Free** | Free with in-app purchases |
| Size | 7 MB | 29 MB |
| Requires iOS | 15.6 | **15.0** |
| Devices | iPhone, iPad, iPod | **iPhone, iPad, iPod, Mac** |
| Age rating | 4+ | 4+ |
| Developer | [Erwan Carriou](https://appshunter.io/developer/1102494853) | [sunata UG (haftungsbeschraenkt)](https://appshunter.io/developer/1387425354) |

## 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


### Diagrams Notepad 3

[App page](https://appshunter.io/ios/app/diagrams-notepad-3/id1387425355)

Create and sync diagrams, flowcharts, and mind maps across iPhone, iPad, and Mac. Supports Apple Pencil for drawing and offers collaboration features. Export in various formats.

**Highlights:** Cross-device sync via iCloud, Vector-based shapes and connectors, Apple Pencil support, Diagram sharing and collaboration, Export to PDF, PNG, JPEG, Unlimited diagram size

**Features:** Family Sharing

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Unlimited number of diagrams | $22.99 | one-time |


## Frequently asked questions

### Is System Designer free?

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

### Is Diagrams Notepad 3 free?

Diagrams Notepad 3 is free to download, with in-app purchases available.

### Which has better reviews, System Designer or Diagrams Notepad 3?

System Designer is rated higher. System Designer averages 4.4 out of 5 from 17 ratings, while Diagrams Notepad 3 averages 3.5 from 51 ratings.

### Do System Designer or Diagrams Notepad 3 have ads?

Neither System Designer nor Diagrams Notepad 3 shows ads.

### Which is updated more often, System Designer or Diagrams Notepad 3?

System Designer ships an update monthly, and Diagrams Notepad 3 monthly. Most recently, System Designer was updated on September 18, 2026 and Diagrams Notepad 3 on June 9, 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.*