System Designer vs Contentos
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.
Contentos
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Contentos turns your ideas and videos into on-brand captions, hooks, hashtags, and ready-to-post social content in seconds. Built for individual creators, freelancers, agencies, and small marketing teams. FREE TO GET STARTED Download Contentos for free and try the full workflow — no purchase required: - 1 brand profile - 10 free AI content generations PREMIUM FEATURES (subscription required) The features below require an auto-renewable subscription (Creator, Marketer, or Agency plan): - Unlimited AI content generations - Multiple brand profiles (Marketer: up to 5, Agency: unlimited) - Full platform suite: Instagram, TikTok, YouTube, X, Facebook, Pinterest - Priority or instant processing speed - Custom CTAs and dedicated agency dashboard support (Agency plan) Plan prices and billing periods (monthly or annual) are displayed in the app before purchase. Payment is charged to your Apple Account at confirmation of purchase. Subscriptions renew automatically unless canceled at least 24 hours before the end of the current period. You can manage or cancel your subscription in your Apple Account settings at any time. Terms of Use: https://api.contentos-ai.com/terms Privacy Policy: https://api.contentos-ai.com/privacy
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Verdict
The clearest difference is in-app purchases: System Designer at none against Contentos's 2. System Designer also leads on device support (3 vs 1). On price, update cadence, ads and iOS requirement 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. Contentos sells 2 in-app purchases, starting at $9.99 per month. System Designer asks for nothing beyond the download.
System Designer ships an update monthly, Contentos every 3 weeks. The most recent releases landed on October 23, 2026 and October 31, 2026 respectively.
| Parameter | System Designer | Contentos |
|---|---|---|
| Price | Free | Free |
| Rating | 4.4 (17 ratings) — better | — |
| Positive reviews | 77.8% of reviews | — |
| Number of ratings | 17 — better | — |
| Update frequency | Monthly | Every 3 weeks — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Free | — |
| Devices | iPhone, iPad, iPod — better | iPhone |
| Requires iOS | 15.6 — better | 16.0 |
| Further details — not scored | ||
| Size | 7 MB | 4 MB |
| Age rating | 4+ | 4+ |
| Developer | Erwan Carriou | DJIONI DEV |
In-app purchases
System Designer
No in-app purchases
Contentos
- Creator Monthly$9.991 Month
- Creator Annual$71.991 Year









