Comparison

Jayson vs nRF Device Firmware Update

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

Jayson

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
Read full description

Jayson is a JSON viewer and editor for iPhone and iPad. Browse JSON as a structure, edit values, and save your changes back to the file. Whether you're inspecting an API response, checking a config file, or making a quick fix on the go, Jayson turns raw JSON into something you can actually read and change. BROWSE AND EDIT - Open JSON files stored on your device or in iCloud Drive. - Toggle between a structured table view and syntax highlighted text. - Add new values and keys, and save your changes back to the file. - Parse text or the contents of a URL from your clipboard into JSON. - Highlight a key from a child of an array to get a quick overview of your data. TABS, SPLITS, AND WINDOWS - Switch between files, or different objects in a single file, using tabs. - Compare JSON in a single file or across files using multiple splits. - Open multiple windows on the iPad. WORKS WITH SHORTCUTS Jayson integrates with Shortcuts, which comes in handy for debugging API calls, previewing JSON files, and building workflows around JSON. - Pass a response from Get Contents of URL to Jayson to see how it is structured. - Open JSON as a document you keep working on, or as a temporary preview. - Format JSON and hand the result to the next action, using spaces or tabs. FREE, WITH AN OPTIONAL UPGRADE Jayson's core functionality is free. Browsing, editing, saving, splits, Shortcuts, and working with up to two tabs at a time cost nothing. A one-time in-app purchase enables having more than two tabs open at once, switching between light and dark themes, and personalizing the app icon, accent color and type icons. One purchase, no subscription.

About

nRF Device Firmware Update

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
Read full description

The nRF5x Series chips are flash-based SoCs, and as such they represent the most flexible solution available. A key feature of the nRF5x Series and their associated software architecture and S-Series SoftDevices is the possibility for Over-The-Air Device Firmware Upgrade (OTA-DFU) over Bluetooth LE. The DFU application allows to update nRF5 devices using Secure or Legacy DFU bootloader from nRF5 SDK version 4.3 or newer. The firmware should be in .zip file format, prepared using "nrf util" (https://github.com/NordicSemiconductor/pc-nrfutil).

Screenshots

Jayson4 screens
nRF Device Firmware Update3 screens

Verdict

The call

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.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

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

ReceptionRating · Positive reviews · Number of ratings

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.

UpkeepUpdate frequency

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.

Scorecard7 real differences · 4 level
Jayson versus nRF Device Firmware Update: the parameters behind the verdict, then further details
ParameterJaysonnRF Device Firmware Update
PriceFreeFree
Rating4.5 (445 ratings) — better2.2 (9 ratings)
Positive reviews80.7% of reviews — better20.0% of reviews
Number of ratings445 — better9
Update frequencyEvery 3 weeks — betterEvery 9 months
AdsNoNo
In-app purchasesYesNo — better
MonetizationFree with in-app purchasesFree — better
Best chart rank#72 — better#183
DevicesiPhone, iPadiPhone, iPad
Requires iOS26.016.0 — better
Further details — not scored
Size41 MB5 MB
Age rating4+4+
DeveloperSimon B. StøvringNordic Semiconductor ASA

Customer experience

Jayson

All ratings425 ratings
Positive85.4%
Neutral6.1%
Negative8.5%
Written reviews83 reviews
Positive80.7%
Neutral7.2%
Negative12.0%

nRF Device Firmware Update

All ratings9 ratings
Positive33.3%
Neutral11.1%
Negative55.6%
Written reviews5 reviews
Positive20.0%
Neutral0.0%
Negative80.0%

Bugs and requests

Jayson

Reported bugs

6 issues
  • 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
Show 1 more
  • Accidental file exit when attempting to navigate

Requested features

9 requests
  • Search/find functionality within files
  • JSON editing and modification capabilities
  • XML format support
  • Split-view for comparing different arrays
  • Export functionality for edited JSON
Show 4 more
  • Comment recognition in JSON files
  • Plain text editor option
  • Improved file size handling for large documents
  • Better navigation controls on mobile devices

nRF Device Firmware Update

Not enough reviews yet to summarise bugs or requests.

In-app purchases

1 purchases

Jayson

One-time1
  • Unlock Everything$4.99
None

nRF Device Firmware Update

No in-app purchases

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 #72 in the App Store charts, and nRF Device Firmware Update at #183. Chart position reflects recent download velocity rather than total install base.

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