rubyi vs System Designer
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
rubyi
Learn, run, and share Ruby scripts with an iOS app offering code completion, syntax highlighting, and a built-in browser. Customize your coding environment and even run code on your Apple Watch.
- Autocomplete
- Auto Indent
- Code coloring
- Run selected text
- Apple Watch code execution
- Code templates
- File system support
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This is an ios ruby app,you can learn,run,share ruby script. Features : Autocomplate. Auto Indent. Code color. In(the built-in browser or the txt editor),Select the text to run. Horizontal screen development. Code templates,the contents of the new file is copy from contents of the template file. *You can run code on the Apple Watch! *You can enter ruby code by keyboard, and then you can execut the ruby code,support the gets function. *You can use the file system to supports txt, pdf, chm, mp3,m4v,zip, gif, png, html, rb ,doc... *You can adjust the code color and font size , and support to move the cursor left and right and up and down , easy to read and write. *You can find learning materials by the built-in browser . *You can save ruby code and learning materials, and can be modified to the save file and delete the save file . *You can control the background image and color, and execution voice , background animation, text color and shadow, switch interface animation , the number and the order of the main interface of the tab bar to create your learning software. *You can Learn ruby knowledge , the system provides some basic learning materials . *You can use ruby code or learning materials to generate two-dimensional code , for easy sharing . *You can share code by Email,Weibo,Twitter,Facebook. *You can use the counter,light in the Setting tab.
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 in-app purchases: System Designer at none against rubyi's 7. System Designer also leads on update cadence (monthly vs every 3 months). rubyi's advantage is rating (4.7 vs 4.4). On price, review sentiment, ratings volume and ads 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. rubyi sells 7 one-off in-app purchases. System Designer asks for nothing beyond the download.
rubyi holds the better App Store score, 4.7 against 4.4. Both are backed by a comparable volume of ratings — 27 and 17 respectively. Written reviews point the same way: 82% of rubyi's written reviews are positive against 78% of System Designer's.
rubyi ships an update every 3 months, System Designer monthly. The most recent releases landed on September 28, 2026 and September 18, 2026 respectively.
| Parameter | rubyi | System Designer |
|---|---|---|
| Price | Free | Free |
| Rating | 4.7 (27 ratings) — better | 4.4 (17 ratings) |
| Positive reviews | 81.7% of reviews — better | 77.8% of reviews |
| Number of ratings | 27 — better | 17 |
| Update frequency | Every 3 months | Monthly — better |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | Free — better |
| Devices | iPhone, iPad, iPod, Apple Watch — better | iPhone, iPad, iPod |
| Requires iOS | 14.0 — better | 15.6 |
| Further details — not scored | ||
| Size | 45 MB | 7 MB |
| Age rating | 17+ | 4+ |
| Developer | 小文 黄 | Erwan Carriou |
Customer experience
rubyi
System Designer
In-app purchases
rubyi
- To remove ads$0.99
- Password Service$0.99
- Horizontal screen development$0.99
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- Simple Vedio$0.99
- Encryption Compression$0.99
- Text Search$0.99
- Autocomplete$0.99
System Designer
No in-app purchases









