# JSON Designer vs System Designer

The clearest difference is rating: System Designer at 4.4 against JSON Designer's 3.3. System Designer also leads on in-app purchases (none vs 1) and review sentiment (78% vs 52%). JSON Designer's advantage is iOS requirement (11.0 vs 15.6). On price, ratings volume, ads and device support there is nothing between them.

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

System Designer holds the better App Store score, 4.4 against 3.3. Both are backed by a comparable volume of ratings — 10 and 17 respectively. Written reviews point the same way: 52% of JSON Designer's written reviews are positive against 78% of System Designer's.

JSON Designer ships an update every 4 months, System Designer monthly. The most recent releases landed on June 10, 2026 and September 18, 2026 respectively.

## The numbers

| Metric | JSON Designer | System Designer |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.3 (10 ratings)](https://appshunter.io/ios/app/json-designer/id432736126/reviews) | **[4.4 (17 ratings)](https://appshunter.io/ios/app/system-designer/id1132983280/reviews)** |
| Number of ratings | 10 | **17** |
| Positive reviews | 52.0% of reviews | **77.8% of reviews** |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 4 months | **Monthly** |
| Monetization | Free with in-app purchases | **Free** |
| Size | 10 MB | 7 MB |
| Requires iOS | **11.0** | 15.6 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Cribster UG (haftungsbeschrankt)](https://appshunter.io/developer/388203112) | [Erwan Carriou](https://appshunter.io/developer/1102494853) |

## What reviewers say

### JSON Designer

[App page](https://appshunter.io/ios/app/json-designer/id432736126)

Visually model and design JSON structures with this intuitive tool. Generate code from your models and export diagrams for documentation. Ideal for developers who want to understand and represent APIs more effectively.

**Highlights:** Graphically model JSON structures, Export JSON models as images, Reverse-generate models from JSON, Browse API examples, Generate Protocol Buffers (.proto), Includes tutorial and open-in functionality

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| App Backer - Code Generators Access | $1.99 | per month |


### 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 JSON Designer free?

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

### Is System Designer free?

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

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

System Designer is rated higher. JSON Designer averages 3.3 out of 5 from 10 ratings, while System Designer averages 4.4 from 17 ratings.

### Do JSON Designer or System Designer have ads?

Neither JSON Designer nor System Designer shows ads.

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

JSON Designer ships an update every 4 months, and System Designer monthly. Most recently, JSON Designer was updated on June 10, 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.*