Comparison

JSON Designer vs Diagrams Notepad 3

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

Head to head
About

JSON Designer

Visually model and design JSON structures with this intuitive tool. Generate code from your models and export diagrams for documentation. Ideal for developers who want to understand and represent APIs more effectively.

Highlights
  • Graphically model JSON structures
  • Export JSON models as images
  • Reverse-generate models from JSON
  • Browse API examples
  • Generate Protocol Buffers (.proto)
  • Includes tutorial and open-in functionality
Features
Read full description

Start modeling - finally! your JSON visualization & design tool If you are new to the app: this app is out for a couple of years now and develpers greatly appreciate it. It is a design tool primarily, and has always been for free as my part of giving back to the developer community. I put some effort in a smoother design and made many adjustments from some valuable feedbacks. Code generators are a separate feature, which is connected to a payment, which is a practical way to show if you value the feature and the app itself. Depending on your feedback the app will be extended with further functionality. Enjoy JSON modeling! tl;dr: Modeling is the core feature and for free as always, code generators have to be paid for (and save lots of time) Despite the long existence of UML and best practices of software engineering you can't find any diagrams in the API documentations of Google, Facebook, Twitter and the likes. So help yourself, stop deciphering unreadable example files and use this new simplified visual representation of JSON structures as object oriented models. Methodology: • Tree structures depict hierarchical structures of objects • Multiplicity indicator of objects and attributes depict arrays Examples and a tutorial are provided inside the App. Use JSON Designer to jump right into defining your API, without reading a single page of JSON documentation. Features: • Graphically model JMs, ie your JSON Models • Export JM images to integrate in documentations • Reverse-generate JMs from URLs or direct JSON input • Browse hand-picked API examples • NEW Generate Protocol Buffers .proto for gRPC • Tutorial • Open-in: exchange JSON files with other apps Stay tuned for new features via @jsondesigner on Twitter. Feedback is gratefully appreciated. More that 65% of JSON Designer users say it's a must-have and are using it daily! Optional code generators for backers (saving you lots of time): Obj-C, Swift, Java, Kotlin, JavaScript, Perl, Python, Ruby, PHP. To back the app, show your gratitude and support further development, simply get the "I'm backing you" app subscription for a couple of month: This subscription brings you access to an extended and growing selection of code generators. It's a recurring monthly subscription, bringing you full access to all code generators for that time. The subscription is allocated as monthly 1.99$ payment. The subscription automatically renews unless auto-renew is turned off at least 24-hours before the end of the current period. Your account will be charged for renewal within 24-hours prior to the end of the current period, and identify the cost of the renewal. The subscription may be managed and auto-renewal may be turned off by going to your Account Settings after purchase. No cancellation of the current subscription is allowed during active subscription period. Any unused portion of a free trial period, if offered, will be forfeited when you purchase the subscription. In regards of subscriptions please review the terms of use and privacy policy on jsondesigner.com/privacyterms

About

Diagrams Notepad 3

Create and sync diagrams, flowcharts, and mind maps across iPhone, iPad, and Mac. Supports Apple Pencil for drawing and offers collaboration features. Export in various formats.

Highlights
  • Cross-device sync via iCloud
  • Vector-based shapes and connectors
  • Apple Pencil support
  • Diagram sharing and collaboration
  • Export to PDF, PNG, JPEG
  • Unlimited diagram size
Features
Read full description

NEW - Create diagrams on iPhone, iPad and Mac and sync them together! New Design - Pencil Support - Folders - File Export/Import - Markup Editing - UML Class Editor and more... Create quickly and creatively wonderful diagrams and notes, flowcharts, mind maps, pinboards, organigrams, software models and AWS diagrams on your iPhone, iPad and Mac. Sync your diagrams optionally and automatically between all iOS and macOS devices. Add shapes, connectors, images, drawings and weblinks. Draw shapes and connectors, take notes and add markup with Apple Pencil or a finger. Share diagrams and collaborate on them with other users through iCloud. Key features • Automatic sync using iCloud between your iOS and macOS devices • Vector based shapes and connectors • Color themes and styles for the entire diagram • Drag and drop (on iPad) or copy and paste to insert graphics, photos or URLs (rich links) from other apps directly to the diagram • Drawing shapes and connectors with Apple Pencil or a finger • Undo and redo all changes • Export diagrams as vector PDF documents or PNG or JPEG images • Diagram iCloud sharing and collaboration with your team or friends • Designed for iOS and iCloud The app uses iCloud to optionally and automatically sync diagrams between your iOS and macOS devices. You can also share your diagrams and collaborate on them with other users. • Diagrams without size limits The diagram automatically resizes to fit your content as you add more shapes. You can add shapes from any side of the diagram. • Each diagram has its own style Your recently used color styles, shapes and connectors will be saved separately for each diagram. • Replace shapes and connectors at any time Replace any selected shapes in the diagram with another shape from the toolbar or with an image or web-link from the clipboard. The existing text and connections of connectors will not change. • Free version with all functions Download the free version of the application and try out all the features. You can add and edit two diagrams with a limited number of shapes in each diagram. Upgrading to an unlimited number of diagrams and shapes is possible through an In-App Purchase. • We are looking forward to your feedback If you enjoy using the Diagrams Notepad app, please add a rating or write a review on the App Store. If you have further questions or suggestions about the app, please send us an e-mail to: info@diagrams-notepad.com Thank you for using the Diagrams Notepad app!

Screenshots

JSON Designer2 screens
Diagrams Notepad 34 screens

Verdict

The call

The clearest difference is update cadence: Diagrams Notepad 3 at monthly against JSON Designer's every 4 months. Diagrams Notepad 3 also leads on rating (3.5 vs 3.3) and ratings volume (51 vs 10). JSON Designer's advantage is review sentiment (52% vs 39%) and iOS requirement (11.0 vs 15.0). On price, ads, in-app purchases and monetization model 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. JSON Designer sells 1 in-app purchase, starting at $1.99 per month and Diagrams Notepad 3 sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

ReceptionRating · Positive reviews · Number of ratings

Diagrams Notepad 3 holds the better App Store score, 3.5 against 3.3. That said, the two scores are not equally well evidenced: Diagrams Notepad 3 has 51 ratings behind it against 10, so its average is the more settled of the two. Written reviews complicate that: 52% of JSON Designer's written reviews are positive against 39% of Diagrams Notepad 3's, so the app with the better star average is not the one people write more warmly about.

UpkeepUpdate frequency

JSON Designer ships an update every 4 months, Diagrams Notepad 3 monthly. The most recent releases landed on June 10, 2026 and October 1, 2026 respectively.

Scorecard5 real differences · 5 level
JSON Designer versus Diagrams Notepad 3: the parameters behind the verdict, then further details
ParameterJSON DesignerDiagrams Notepad 3
PriceFreeFree
Rating3.3 (10 ratings)3.5 (51 ratings) — better
Positive reviews52.0% of reviews — better39.0% of reviews
Number of ratings1051 — better
Update frequencyEvery 4 monthsMonthly — better
AdsNoNo
In-app purchasesYesYes
MonetizationFree with in-app purchasesFree with in-app purchases
DevicesiPhone, iPad, iPodiPhone, iPad, iPod, Mac — better
Requires iOS11.0 — better15.0
Further details — not scored
Size10 MB29 MB
Age rating4+4+
DeveloperCribster UG (haftungsbeschrankt)sunata UG (haftungsbeschraenkt)

Customer experience

JSON Designer

All ratings10 ratings
Positive40.0%
Neutral30.0%
Negative30.0%
Written reviews50 reviews
Positive52.0%
Neutral10.0%
Negative38.0%

Diagrams Notepad 3

All ratings51 ratings
Positive62.7%
Neutral3.9%
Negative33.3%
Written reviews105 reviews
Positive39.0%
Neutral8.6%
Negative52.4%

In-app purchases

1 purchases

JSON Designer

Subscriptions1
  • App Backer - Code Generators Access$1.991 Month
1 purchases

Diagrams Notepad 3

One-time1
  • Unlimited number of diagrams$22.99

Questions

Is JSON Designer free?
JSON Designer is free to download, with in-app purchases available.
Is Diagrams Notepad 3 free?
Diagrams Notepad 3 is free to download, with in-app purchases available.
Which has better reviews, JSON Designer or Diagrams Notepad 3?
Diagrams Notepad 3 is rated higher. JSON Designer averages 3.3 out of 5 from 10 ratings, while Diagrams Notepad 3 averages 3.5 from 51 ratings.
Do JSON Designer or Diagrams Notepad 3 have ads?
Neither JSON Designer nor Diagrams Notepad 3 shows ads.
Which is updated more often, JSON Designer or Diagrams Notepad 3?
JSON Designer ships an update every 4 months, and Diagrams Notepad 3 monthly. Most recently, JSON Designer was updated on June 10, 2026 and Diagrams Notepad 3 on October 1, 2026.

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