# Jayson vs nRF Device Firmware Update

The clearest difference is review sentiment: Jayson at 81% against nRF Device Firmware Update's 20%. Jayson also leads on rating (4.5 vs 2.2) and update cadence (every 3 weeks vs every 9 months). nRF Device Firmware Update's advantage is in-app purchases (none vs 1) and iOS requirement (16.0 vs 26.0). On price, ads, chart position and device support there is nothing between them.

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

Jayson holds the better App Store score, 4.5 against 2.2. That said, the two scores are not equally well evidenced: Jayson has 445 ratings behind it against 9, 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 20% of nRF Device Firmware Update's.

Jayson ships an update every 3 weeks, nRF Device Firmware Update every 9 months. The most recent releases landed on October 29, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | Jayson | nRF Device Firmware Update |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.5 (445 ratings)](https://appshunter.io/ios/app/jayson/id1447750768/reviews)** | [2.2 (9 ratings)](https://appshunter.io/ios/app/nrf-device-firmware-update/id1624454660/reviews) |
| Number of ratings | **445** | 9 |
| Positive reviews | **80.7% of reviews** | 20.0% of reviews |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 3 weeks** | Every 9 months |
| Monetization | Free with in-app purchases | **Free** |
| Best chart rank | **#79** | #163 |
| Size | 41 MB | 5 MB |
| Requires iOS | 26.0 | **16.0** |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Simon B. Støvring](https://appshunter.io/developer/423532907) | [Nordic Semiconductor ASA](https://appshunter.io/developer/497679114) |

## What reviewers say

### Jayson

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

**Currently charting:** #79 Top Free · Developer Tools, #162 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


### nRF Device Firmware Update

[App page](https://appshunter.io/ios/app/nrf-device-firmware-update/id1624454660)

**Currently charting:** #163 Top Free · Developer Tools (US App Store)

This application enables Over-The-Air Device Firmware Upgrade (OTA-DFU) for nRF5 devices using Bluetooth LE. It supports updating firmware in .zip format, prepared with the 'nrf util' tool.

**Highlights:** Over-The-Air Device Firmware Upgrade (OTA-DFU), Bluetooth LE connectivity, Supports nRF5x Series chips, Updates Secure or Legacy DFU bootloaders, Requires .zip firmware format, Uses 'nrf util' for firmware preparation

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Jayson free?

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

### Is nRF Device Firmware Update free?

nRF Device Firmware Update is free to download, with no in-app purchases.

### Which has better reviews, Jayson or nRF Device Firmware Update?

Jayson is rated higher. Jayson averages 4.5 out of 5 from 445 ratings, while nRF Device Firmware Update averages 2.2 from 9 ratings.

### Do Jayson or nRF Device Firmware Update have ads?

Neither Jayson nor nRF Device Firmware Update shows ads.

### Which is updated more often, Jayson or nRF Device Firmware Update?

Jayson ships an update every 3 weeks, and nRF Device Firmware Update every 9 months. Most recently, Jayson was updated on October 29, 2026 and nRF Device Firmware Update on October 31, 2026.

### Which is more popular, Jayson or nRF Device Firmware Update?

Jayson currently peaks at #79 in the App Store charts, and nRF Device Firmware Update at #163. 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.*