Last 30 days
Last 30 days
Avg per download
435 reviews
Last 30 days
Last 30 days
Avg rev. per download
435 reviews
Performance Insights
Category rankings
Competition level
Low competitionUnder 100K on both downloads and revenue — the kind of niche a small team can still take.
On the store
Released February 2019 · 19 releases since
Jayson is an iOS app (Free) by Simon B. Støvring in the developer tools category, holding #85 in the free developer tools charts. It draws an estimated 5K downloads a month and holds a 4.5-star rating.
- Monetizes through in-app purchases priced at $4.99.
- Ships new versions about one a fortnight.
- Latest version is 1.5.2, released August 21, 2026.
- 79% of ratings are five-star.
- Available in 1 language.
- Strongest in JP, BR, CN.
- Downloads at 35.1 MB and requires iOS 26.0+.
- Rated 4+.
App details
- Version
- 1.5.2
- Release status
- Worldwide
- Age rating
- 4+
- Requires
- iOS 26.0+
- Size
- 35.1 MB
- Languages
- English
- Price
- Free
- First seen
- February 2019
- Top markets
- JP, BR, CN
- Publisher country
- Denmark
- Website
- Visit website
- Support
- Visit support
Release history
19 versions tracked
- Version 1.5.2Latest
- Version 1.5.1
- Version 1.5.0
- Version 1.4.2
- Version 1.4.1
- Version 1.4
- Version 1.3.4
- Version 1.3.3
- Version 1.3.2
- Version 1.3.1
- Version 1.3
- Version 1.2.2
Ships about one a fortnight.
In-app purchases
1 product · United States
- Unlock EverythingOne-time$4.99
What users say
- 4.0
LOVE The App, NOT a Fan of a Recent Change..
Jayson, my go-to tool for viewing and verifying JSON in Shortcuts development, has always been well-designed, reliable, and feature-packed. Its smooth, aesthetically pleasing, and intuitive UI extends these aspects to Shortcuts. However, my only complaint about the recent major update (v1.5.0) is the change to the ‘view JSON’ Shortcuts action. Before the update, this action allowed users to send or view input JSON to or in the App itself or via a notification. I used the notification option to open JSON text seamlessly, without interrupting my workflow. Shortcuts continued running, and I could view or exit JSON in the App anytime by tapping the notification. I could also preview JSON directly from the notification by long-pressing it. Unfortunately, the update removed the option to open JSON in a notification, making the only way to view JSON by leaving Shortcuts and opening the Jayson App. While this change doesn’t make the App unusable, it negatively impacts its implementation and overall utility for Shortcuts development. Lastly, I want to clarify: all new features/changes in the recent update are great! I’ll continue using Jayson in most future Shortcut builds. Despite my complaint, I highly recommend Jayson to anyone who regularly deals with JSON text on iOS, especially via Shortcuts.
Reviewed on version 1.5.2
- 4.0
I like it so far
Can you view two different arrays on the same split? I feel like you should be able to… side by side is enabled in landscape… but it seems again only for the same array. You can drag and drop one though to a different position so it’s almost there, assuming I’m not just missing how to do it.
Reviewed on version 1.4.2
- 5.0
I Am No Longer Afraid of JSON
All of Simon’s apps are genius and wholly unique, but Jayson will always have a special place in mine own heart as the single application which finally killed my phobia of JSON, in general. It is by far the most elegant and intelligent means of manipulating JSON dictionaries I’ve ever seen on any platform. I’ve worked with both the iOS and macOS apps, now, and both are - dare I say it - a genuine joy to use. BUY!
Reviewed on version 1.4.2
About Jayson
1,757 characters
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.
Screenshots
7 iPhone screenshots
Jayson iOS app monetises through in-app purchases. The current products and price points are listed in the in-app purchases table on this page.
Jayson iOS app download estimates are updated daily. The app maintains a 4.5-star rating based on 435 user reviews, indicating strong user satisfaction in the developer tools market.
Jayson iOS app ranks #85 in the free developer tools charts. The app's performance metrics suggest significant growth potential in a low-competition segment.
You can download Jayson iOS app from the App Store for iOS devices, requiring iOS 26.0 or later. The app offers in-app purchases for enhanced functionality.
View on App Store