# System Designer vs Quantum Programming Compiler

The clearest difference is rating: System Designer at 4.4 against Quantum Programming Compiler's 3.4. System Designer also leads on in-app purchases (none vs 4) and ads (none vs shown). Quantum Programming Compiler's advantage is iOS requirement (12.0 vs 15.6). On price, ratings volume, update cadence and device support there is nothing between them.

Both are free to download. Quantum Programming Compiler sells 4 in-app purchases, starting at $2.99 per month. System Designer asks for nothing beyond the download.

System Designer holds the better App Store score, 4.4 against 3.4. Both are backed by a comparable volume of ratings — 17 and 8 respectively. Written reviews point the same way: 78% of System Designer's written reviews are positive against 67% of Quantum Programming Compiler's.

Both ship on a similar rhythm, roughly monthly. The most recent releases landed on September 18, 2026 and September 23, 2026 respectively.

## The numbers

| Metric | System Designer | Quantum Programming Compiler |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.4 (17 ratings)](https://appshunter.io/ios/app/system-designer/id1132983280/reviews)** | [3.4 (8 ratings)](https://appshunter.io/ios/app/quantum-programming-compiler/id1337663853/reviews) |
| Number of ratings | **17** | 8 |
| Positive reviews | **77.8% of reviews** | 66.7% of reviews |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Monthly | Monthly |
| Monetization | **Free** | Free with in-app purchases |
| Size | 7 MB | 25 MB |
| Requires iOS | 15.6 | **12.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Erwan Carriou](https://appshunter.io/developer/1102494853) | [Ketan Appa](https://appshunter.io/developer/576435759) |

## 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


### Quantum Programming Compiler

[App page](https://appshunter.io/ios/app/quantum-programming-compiler/id1337663853)

Learn and execute quantum computing code directly on your mobile device. This app offers tutorials for beginners and professionals, a code editor with syntax highlighting, and the ability to compile and run quantum programs using Python 3.7.

**Highlights:** Compile and run quantum programs, Syntax highlighting editor, Custom keyboard for quantum characters, Plotting and graphing support, Easy and advanced tutorials, Open, save, import, and share files

**Features:** Vision Pro support

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 1 Month Subscription | $2.99 | per month |
| 6 Months | $11.99 | per 6 months |
| 1 Year | $17.99 | per year |
| Upgrade | $6.99 | one-time |


## Frequently asked questions

### Is System Designer free?

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

### Is Quantum Programming Compiler free?

Quantum Programming Compiler is free to download, with in-app purchases available.

### Which has better reviews, System Designer or Quantum Programming Compiler?

System Designer is rated higher. System Designer averages 4.4 out of 5 from 17 ratings, while Quantum Programming Compiler averages 3.4 from 8 ratings.

### Do System Designer or Quantum Programming Compiler have ads?

Quantum Programming Compiler shows ads; System Designer does not.

### Which is updated more often, System Designer or Quantum Programming Compiler?

System Designer ships an update monthly, and Quantum Programming Compiler monthly. Most recently, System Designer was updated on September 18, 2026 and Quantum Programming Compiler on September 23, 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.*