# Jayson vs Carnets

The clearest difference is in-app purchases: Carnets at none against Jayson's 1. Carnets also leads on iOS requirement (14.0 vs 26.0). On price, rating, review sentiment and ratings volume there is nothing between them.

Both are free to download. Jayson sells 1 one-off in-app purchase. Carnets asks for nothing beyond the download.

On the App Store both sit at effectively the same score — 4.5 for Jayson against 4.6 for Carnets. Both are backed by a comparable volume of ratings — 425 and 316 respectively. Written reviews are what separate them: 81% of Jayson's written reviews are positive against 78% of Carnets's.

Jayson ships an update every 3 weeks, Carnets monthly. The most recent releases landed on September 23, 2026 and September 24, 2026 respectively.

## The numbers

| Metric | Jayson | Carnets |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.5 (425 ratings)](https://appshunter.io/ios/app/jayson/id1447750768/reviews) | **[4.6 (316 ratings)](https://appshunter.io/ios/app/carnets-jupyter/id1450994949/reviews)** |
| Number of ratings | **425** | 316 |
| Positive reviews | **80.7% of reviews** | 78.4% of reviews |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 3 weeks** | Monthly |
| Monetization | Free with in-app purchases | **Free** |
| Best chart rank | **#77** | #98 |
| Size | 41 MB | 1.4 GB |
| Requires iOS | 26.0 | **14.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 17+ |
| Developer | [Simon B. Støvring](https://appshunter.io/developer/423532907) | [Nicolas Holzschuch](https://appshunter.io/developer/1450994948) |

## What reviewers say

### Jayson

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

**Currently charting:** #77 Top Free · Developer Tools, #102 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


### Carnets

[App page](https://appshunter.io/ios/app/carnets-jupyter/id1450994949)

**Currently charting:** #98 Top Free · Developer Tools (US App Store)

This app offers a standalone Jupyter notebook environment for creating and running code snippets, combining them with text and Markdown. It includes pre-installed scientific packages and allows for offline use, making it ideal for education and research.

**Highlights:** Standalone Jupyter notebook implementation, Embedded Python interpreter, Offline functionality, Pre-installed scientific packages, Supports Jupyterlab, Package installation via %pip, Notebook sharing and opening

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none

**What reviewers like**

- 🚀 Excellent app for coding on iPad
- 👍 Convenient for learning and coding on the go
- 🚀 Works just like Jupyter Notebook on desktop
- 👍 Helpful for self-learning Python
- 👍 Useful for data science and machine learning

**What reviewers complain about**

- 🐛 Bugs and stability issues
- 🔋 Battery drain and overheating
- 🔒 Unauthorized access to photo library
- 🐛 Issues with importing certain libraries like SciPy and Scikit-learn

**Reported bugs**

- Crashes and freezes
- Issues with saving and loading notebooks
- Problems with running scripts and notebooks
- Incompatibility with newer iOS versions

**Requested features**

- Add support for SciPy, Scikit-learn, and other scientific computing libraries
- Improve file management and integration with cloud storage services
- Implement split-screen or multi-window support
- Add more keyboard shortcuts and customization options
- Improve error handling and provide more detailed error messages


## Frequently asked questions

### Is Jayson free?

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

### Is Carnets free?

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

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

Carnets is rated higher. Jayson averages 4.5 out of 5 from 425 ratings, while Carnets averages 4.6 from 316 ratings.

### Do Jayson or Carnets have ads?

Neither Jayson nor Carnets shows ads.

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

Jayson ships an update every 3 weeks, and Carnets monthly. Most recently, Jayson was updated on September 23, 2026 and Carnets on September 24, 2026.

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

Jayson currently peaks at #77 in the App Store charts, and Carnets at #98. 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.*