Code Master vs System Designer
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Code Master
This app offers a visual interface for creating and editing source code for any language, with preview and publishing options. It provides a professional way to manage and share your coding projects on iOS devices, supporting over 170 languages and offering various themes and templates.
- Syntax highlighting for 170+ languages
- 70+ syntax colored themes
- HTML5 templates and website builder
- Live code preview in browser
- File upload and sharing
- External keyboard support
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The most downloaded code editor on the App Store, now free. The Code Master Programming Suite for the iOS platform provides a visual interface for creating and editing universal source code of any language, as well as previewing and publishing options for when you are on-the-go. All of this packaged up into a single application for a professional way to manage and share your creations on all of your iOS devices. FEATURES • Dedicated Syntax Highlighting • Support for 170+ Languages • 70+ Syntax Coloured Themes • Free HTML5 Templates • New Website Template Builder • Create & Work with Any Type of File • Dedicated Web Development Support • Preview Code in a Fully Functional Web Browser • Upload & Share Files with Ease • External Dock & Bluetooth Keyboard Support • File Previews for Supported Media Files Use Code Master to stay on top of the latest in web publishing tools. HTML5, CSS3, JavaScript, jQuery and more have been fully integrated into the full fledged editor. EDITOR Code like you would on a desktop computer – with over 170 languages, and more than 70 coloured themes, editing your code on-the-go has never been so easy. Develop in a comfortable environment with the same look and feel that you'd get with any fully featured, premium code editor. TEMPLATES Choose from one of our professionally designed HTML5 templates that are available to users, commercial-free! Turning website building from a complex process for some, to an easy two-step solution. Code Master is designed for any user looking to save time. All templates have been designed for use with both desktop computers and mobile devices. Optimizations for all device types are included. LIVE PREVIEW Our live preview tool will also allow you to save time by allowing you the ability preview all of your pages and files before publishing. With the tap of a button you can view all your content in the offline browser so you can easily and quickly fix every little detail to avoid embarrassing mistakes. New updates will be arriving on a weekly to monthly basis. There is always something to look forward to. 1e6c5f3933
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.
Screenshots
Verdict
The clearest difference is review sentiment: System Designer at 78% against Code Master's 28%. System Designer also leads on rating (4.4 vs 2.7) and update cadence (monthly vs every 5 months). Code Master's advantage is ratings volume (55 vs 17) and iOS requirement (8.0 vs 15.6). 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
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
System Designer holds the better App Store score, 4.4 against 2.7. Both are backed by a comparable volume of ratings — 55 and 17 respectively. Written reviews point the same way: 28% of Code Master's written reviews are positive against 78% of System Designer's.
Code Master ships an update every 5 months, System Designer monthly. The most recent releases landed on September 30, 2026 and September 18, 2026 respectively.
| Parameter | Code Master | System Designer |
|---|---|---|
| Price | Free | Free |
| Rating | 2.7 (55 ratings) | 4.4 (17 ratings) — better |
| Positive reviews | 28.3% of reviews | 77.8% of reviews — better |
| Number of ratings | 55 — better | 17 |
| Update frequency | Every 5 months | Monthly — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 8.0 — better | 15.6 |
| Further details — not scored | ||
| Size | 46 MB | 7 MB |
| Age rating | 4+ | 4+ |
| Developer | Justin Bush | Erwan Carriou |
Customer experience
Code Master
System Designer
Bugs and requests
Code Master
Reported bugs
4 issues- Saved files disappearing or not loading correctly
- Syntax highlighting and language settings not persisting
- Keyboard blocking view of code
- Frequent crashes and freezes
Requested features
5 requests- Add blank page option for custom themes
- Implement cloud storage support (Dropbox, Google Drive)
- Improve keyboard functionality and text editing
- Introduce code execution and debugging capabilities
- Provide more language support beyond HTML/XML
System Designer
Not enough reviews yet to summarise bugs or requests.
In-app purchases
Code Master
No in-app purchases
System Designer
No in-app purchases









