# Justinmind vs System Designer

The clearest difference is rating: System Designer at 4.4 against Justinmind's 3.3. System Designer also leads on review sentiment (78% vs 52%) and update cadence (monthly vs every 5 months). Justinmind's advantage is iOS requirement (12.0 vs 15.6). On price, ratings volume, ads and in-app purchases there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

System Designer holds the better App Store score, 4.4 against 3.3. Both are backed by a comparable volume of ratings — 15 and 17 respectively. Written reviews point the same way: 52% of Justinmind's written reviews are positive against 78% of System Designer's.

Justinmind ships an update every 5 months, System Designer monthly. The most recent releases landed on September 15, 2026 and September 18, 2026 respectively.

## The numbers

| Metric | Justinmind | System Designer |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.3 (15 ratings)](https://appshunter.io/ios/app/justinmind/id891264087/reviews) | **[4.4 (17 ratings)](https://appshunter.io/ios/app/system-designer/id1132983280/reviews)** |
| Number of ratings | 15 | **17** |
| Positive reviews | 52.4% of reviews | **77.8% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 5 months | **Monthly** |
| Monetization | Free | Free |
| Size | 8 MB | 7 MB |
| Requires iOS | **12.0** | 15.6 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Justinmind](https://appshunter.io/developer/891264090) | [Erwan Carriou](https://appshunter.io/developer/1102494853) |

## What reviewers say

### Justinmind

[App page](https://appshunter.io/ios/app/justinmind/id891264087)

Create fully functional mobile app prototypes with advanced gestures, transitions, and effects. View and test your designs on mobile devices, even offline, for seamless demos and presentations.

**Highlights:** Create interactive prototypes, Mobile gestures and transitions, Offline prototype viewing, Cloud sharing, Mobile and tablet adaptation

**In-app purchases:** none


### 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


## Frequently asked questions

### Is Justinmind free?

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

### Is System Designer free?

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

### Which has better reviews, Justinmind or System Designer?

System Designer is rated higher. Justinmind averages 3.3 out of 5 from 15 ratings, while System Designer averages 4.4 from 17 ratings.

### Do Justinmind or System Designer have ads?

Neither Justinmind nor System Designer shows ads.

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

Justinmind ships an update every 5 months, and System Designer monthly. Most recently, Justinmind was updated on September 15, 2026 and System Designer on September 18, 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.*