System Designer vs JSitor
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
System Designer
Design complex systems using a low-code platform that leverages UML standards. Generate code skeletons and manage components graphically. Run and test your system with dynamic type checking.
- UML-based system modeling
- Code skeleton generation
- Graphical component creation
- MSON format for model definition
- Dynamic type checking
- Cross-device synchronization via GitHub
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System Designer is a low-code development platform for creating systems. No matter the frameworks you use and the code you write, the most important is the model that you define to create your system. System Designer helps you to design this model and to generate the classes and components to build your system. DESIGN YOUR SYSTEM WITH EASE If you look at the different JavaScript frameworks on the market, you will notice that they all have their own way to define a model, generally only with code. System Designer uses UML, a standard, to define your model. So you probably already know how to design in System Designer even if you have never run it. The definition of the model is stored on a JSON format called MSON. With MSON you can define types, classes, one to one / one to many relationships and multi inheritance between classes. CODE THE BEHAVIOR OF YOUR SYSTEM Once you have created your model, System Designer generates the skeletons of all your methods. You only have then to add your code to implement them. System Designer provides you helpers to manage your components. You can easily navigate threw your components to create your application. CREATE COMPONENTS GRAPHICALLY There is no need to code to instantiate a component. Create a component in System Designer is like creating a document in a NoSQL Database. In fact, System Designer acts as an ODM (Object-Document Mapper) to manage your components as NoSQL Documents. RUN YOUR SYSTEM You can run your system directly from System Designer. Because you have defined a model for your application, a Dynamic Type Check is done on every action of your system. All warnings are send and shown in System Designer. DESIGN ON THE GO System Designer can be used on macOS, iPad or any browsers. System Designer has a Github module to synchronize your work between all these apps. You can begin your design on your Mac and then continue it on your iPad.
JSitor
This advanced editor allows you to write, test, and share JavaScript, CSS, and HTML code snippets on your mobile device. It offers a rich editing experience with language support, code suggestions, and snippet management. Explore and fork code from other users, and sync your work with the web version.
- Supports JS, JSX, TS, CSS, SASS, HTML, Pug
- Code suggestions and shortcut keys
- Code snippet management
- Predefined templates
- Drafts for resuming work
- Explore, fork, and share snippets
- Auto-sync with web version
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An advanced editor to write, test and share JavaScript, CSS, and HTML snippets in mobile phones and tablets. Below are the main features - 1. Support various languages mode such as - JS, JSX, TypeScript, CSS, SASS, SCSS, PostCSS, Less, HTML, Pug. 2. Best in-class editor experience with quick shortcut keys and code suggestions to write faster. 3. Inbuilt options to quickly select, cut, copy, paste and format the code snippets. 4. Easily manage snippet CDN libraries, settings, language modes and various other editor options. 5. Start with predefined templates to start really quick 6. Start with where you left previously using drafts 7. View, editor, fork and share what others are doing using explore option 8. Simplified profile management 9. Auto synchronizes snippets to web version (jsitor.com) Please note that - These snippets are stored in JSitor server(not drafts) and can be easily shared with others. All snippets available on this application are publicly accessible. The author of this application is not responsible or liable for loss or damage of any kind during the usage of provided code. Report issue - https://github.com/jsitor/jsitor/issues Privacy Policy - https://github.com/jsitor/jsitor/blob/master/PrivacyPolicy.md Website - https://jsitor.com
Screenshots
Verdict
The clearest difference is price: System Designer at Free against JSitor's $0.99. System Designer also leads on rating (4.4 vs 3.6) and review sentiment (78% vs 45%). JSitor's advantage is update cadence (fortnightly vs monthly) and iOS requirement (9.0 vs 15.6). On ratings volume, 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
System Designer is free to download; JSitor costs $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.
System Designer holds the better App Store score, 4.4 against 3.6. Both are backed by a comparable volume of ratings — 17 and 30 respectively. Written reviews point the same way: 78% of System Designer's written reviews are positive against 45% of JSitor's.
System Designer ships an update monthly, JSitor fortnightly. The most recent releases landed on September 18, 2026 and September 21, 2026 respectively.
| Parameter | System Designer | JSitor |
|---|---|---|
| Price | Free — better | $0.99 |
| Rating | 4.4 (17 ratings) — better | 3.6 (30 ratings) |
| Positive reviews | 77.8% of reviews — better | 45.5% of reviews |
| Number of ratings | 17 | 30 — better |
| Update frequency | Monthly | Fortnightly — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 15.6 | 9.0 — better |
| Further details — not scored | ||
| Size | 7 MB | 31 MB |
| Age rating | 4+ | 4+ |
| Developer | Erwan Carriou | ASHVIN SUTHAR |
Customer experience
System Designer
JSitor
In-app purchases
System Designer
No in-app purchases
JSitor
No in-app purchases









