# Jayson vs MermaidEditor

The clearest difference is review sentiment: Jayson at 81% against MermaidEditor's 14%. Jayson also leads on price (Free vs $3.99) and rating (4.5 vs 2.3). MermaidEditor's advantage is in-app purchases (none vs 1) and device support (4 vs 2). On update cadence, ads and chart position there is nothing between them.

Jayson is free to download; MermaidEditor costs $3.99 up front. Jayson sells 1 one-off in-app purchase. MermaidEditor asks for nothing beyond the download.

Jayson holds the better App Store score, 4.5 against 2.3. That said, the two scores are not equally well evidenced: Jayson has 425 ratings behind it against 10, so its average is the more settled of the two. Written reviews point the same way: 81% of Jayson's written reviews are positive against 14% of MermaidEditor's.

Both ship on a similar rhythm, roughly every 3 weeks. Both last shipped on October 17, 2026.

## The numbers

| Metric | Jayson | MermaidEditor |
| --- | --- | --- |
| Price | **Free** | $3.99 |
| Rating | **[4.5 (425 ratings)](https://appshunter.io/ios/app/jayson/id1447750768/reviews)** | [2.3 (10 ratings)](https://appshunter.io/ios/app/mermaideditor/id1581312955/reviews) |
| Number of ratings | **425** | 10 |
| Positive reviews | **80.7% of reviews** | 13.8% of reviews |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 3 weeks | Every 3 weeks |
| Monetization | **Free with in-app purchases** | Paid |
| Best chart rank | **#103** | #116 |
| Size | 41 MB | 125 MB |
| Requires iOS | 26.0 | **14.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod, Mac** |
| Age rating | 4+ | 4+ |
| Developer | [Simon B. Støvring](https://appshunter.io/developer/423532907) | [基伟 徐](https://appshunter.io/developer/391905315) |

## What reviewers say

### Jayson

[App page](https://appshunter.io/ios/app/jayson/id1447750768)

**Currently charting:** #103 Top Free · Developer Tools, #166 Top Grossing · Developer Tools (US App Store)

This app allows you to view and edit JSON files directly on your device. It offers features like tabbed browsing, split-screen comparisons, and integration with Siri Shortcuts and the Share Sheet for easy JSON parsing and management.

**Highlights:** Browse JSON files, Table or syntax highlighted text view, Tabbed interface, Multiple splits for comparison, Siri Shortcuts integration, Share Sheet Actions, URL schemes

**Features:** Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Unlock Everything | $4.99 | one-time |

**What reviewers like**

- 👍 Elegant and intuitive JSON editing interface
- 🎯 Perfect for FNF mod development and updates
- 📱 Excellent iOS implementation with native feel
- 🔧 Powerful JSON manipulation capabilities
- ⚡ Great Shortcuts and URL scheme integration

**What reviewers complain about**

- 🐛 Frequent crashes and instability issues
- 🔋 High battery consumption and device heating
- ❌ Missing search functionality
- 📵 Safari browser support issues
- 🔒 Limited free features, paywall for advanced options

**Reported bugs**

- App crashes when opening large JSON files (89MB+)
- Crashes on regular use despite functionality
- Device freezing for extended periods
- Safari compatibility broken in recent updates
- Navigation back through JSON structure is unreliable

**Requested features**

- Search/find functionality within files
- JSON editing and modification capabilities
- XML format support
- Split-view for comparing different arrays
- Export functionality for edited JSON


### MermaidEditor

[App page](https://appshunter.io/ios/app/mermaideditor/id1581312955)

**Currently charting:** #116 Top Paid · Developer Tools (US App Store)

Create and edit diagrams and charts using mermaid-js syntax with real-time preview. Export your creations as PNG or SVG files and share them across all your Apple devices.

**Highlights:** Mermaid-js syntax highlighting, Code completion, Instant preview, Export to PNG/SVG, Cross-device editing, QuickLook preview extension

**Features:** Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Jayson free?

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

### Is MermaidEditor free?

MermaidEditor costs $3.99, with no in-app purchases.

### Which has better reviews, Jayson or MermaidEditor?

Jayson is rated higher. Jayson averages 4.5 out of 5 from 425 ratings, while MermaidEditor averages 2.3 from 10 ratings.

### Do Jayson or MermaidEditor have ads?

Neither Jayson nor MermaidEditor shows ads.

### Which is updated more often, Jayson or MermaidEditor?

Jayson ships an update every 3 weeks, and MermaidEditor every 3 weeks. Most recently, Jayson was updated on October 17, 2026 and MermaidEditor on October 17, 2026.

### Which is more popular, Jayson or MermaidEditor?

Jayson currently peaks at #103 in the App Store charts, and MermaidEditor at #116. Chart position reflects recent download velocity rather than total install base.

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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.*