# JSON Designer vs Diagrams Notepad 3

The clearest difference is update cadence: Diagrams Notepad 3 at monthly against JSON Designer's every 4 months. Diagrams Notepad 3 also leads on rating (3.5 vs 3.3) and ratings volume (51 vs 10). JSON Designer's advantage is review sentiment (52% vs 39%) and iOS requirement (11.0 vs 15.0). On price, ads, in-app purchases and monetization model there is nothing between them.

Both are free to download. JSON Designer sells 1 in-app purchase, starting at $1.99 per month and Diagrams Notepad 3 sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

Diagrams Notepad 3 holds the better App Store score, 3.5 against 3.3. That said, the two scores are not equally well evidenced: Diagrams Notepad 3 has 51 ratings behind it against 10, so its average is the more settled of the two. Written reviews complicate that: 52% of JSON Designer's written reviews are positive against 39% of Diagrams Notepad 3's, so the app with the better star average is not the one people write more warmly about.

JSON Designer ships an update every 4 months, Diagrams Notepad 3 monthly. The most recent releases landed on June 10, 2026 and October 1, 2026 respectively.

## The numbers

| Metric | JSON Designer | Diagrams Notepad 3 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.3 (10 ratings)](https://appshunter.io/ios/app/json-designer/id432736126/reviews) | **[3.5 (51 ratings)](https://appshunter.io/ios/app/diagrams-notepad-3/id1387425355/reviews)** |
| Number of ratings | 10 | **51** |
| Positive reviews | **52.0% of reviews** | 39.0% of reviews |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 4 months | **Monthly** |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 10 MB | 29 MB |
| Requires iOS | **11.0** | 15.0 |
| Devices | iPhone, iPad, iPod | **iPhone, iPad, iPod, Mac** |
| Age rating | 4+ | 4+ |
| Developer | [Cribster UG (haftungsbeschrankt)](https://appshunter.io/developer/388203112) | [sunata UG (haftungsbeschraenkt)](https://appshunter.io/developer/1387425354) |

## 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 |


### 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 JSON Designer free?

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

### Is Diagrams Notepad 3 free?

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

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

Diagrams Notepad 3 is rated higher. JSON Designer averages 3.3 out of 5 from 10 ratings, while Diagrams Notepad 3 averages 3.5 from 51 ratings.

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

Neither JSON Designer nor Diagrams Notepad 3 shows ads.

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

JSON Designer ships an update every 4 months, and Diagrams Notepad 3 monthly. Most recently, JSON Designer was updated on June 10, 2026 and Diagrams Notepad 3 on October 1, 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.*