System Designer vs Directional Well Survey
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.
Directional Well Survey
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This "Directional Well Survey" application provides an easy and useful tool for students and directional engineers to edit, calculate interpolations and plot survey stations of the horizontal and directional wells using the five calculation methods (tangential, balanced tangential, minimum curvature, radius of curvature, angle averaging). This application does not normally edit well planning. But it is still possible to edit only via CSV text. The well planning can be built and edited using our apps "Directional Well Planning" or "Directional Drilling" available in our portfolio. The data files (*.ddf) including well planning and survey stations are compatible and can be shared via iCloud. The well planning and survey stations can also be imported from CSV text files, for example: "MD","INC","AZI","TVD","N/S","E/W" "1000.0","0.0","0.0","1000.0","0.0","0.0" "1100.0","3.0","10.0" "1200.0","6.0","15.0" ... The values can be "quoted" or unquoted and separated by: - Comma: 1.00,2.00,3.00 - Semicolon: 1.00;2.00;3.00 or 1,00;2,00;3,00 - Tab: 1.00 2.00 3.00 (TSV file) - Space: 1.00 2.00 3.00 Please, before purchasing, make sure that this application will be useful for you. This application was developed based on existing spreadsheets. There is no comparison with any other software. Our goal was to create a very low cost application with the help of experts to share with drilling engineers, technicians, drillers, drilling engineering students and teachers. It is not intended to replace professional software. You can contribute with suggestions for improvements, correcting the English translation, reporting bugs and sharing it with your friends. Features: 1. Easy tool to edit survey stations (add, insert, edit, del) 2. Easy tool to import/export well planning and survey stations using CSV text format (well planning up to 20 sections) 3. 2D and 3D well plotting (vertical section and plan view) 4. Easy tool for interpolation calculations between two survey stations 5. Dynamic visualization of the interpolation parameters in the plot 6. Ability to work with data files (editing locally and sharing on iCloud) 7. Sharing data files with other applications in our portfolio (Directional Drilling, Directional Well Planning and Multilateral Directional Wells). DISCLAIMER: These tools & materials are provided 'as is' without warranties of any kind, express or implied. Please verify the tools provided by this application by yourself before you use them. Ensure you understand the impact of using these tools. Any use you choose to make of these tools & materials is undertaken by you entirely at you own risk.
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Verdict
The clearest difference is price: System Designer at Free against Directional Well Survey's $14.99. System Designer also leads on update cadence (monthly vs every 18 months). Directional Well Survey's advantage is iOS requirement (11.0 vs 15.6). On ads, in-app purchases and device support 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; Directional Well Survey costs $14.99 up front. Neither carries in-app purchases, so what you see is what you pay.
System Designer ships an update monthly, Directional Well Survey every 18 months. The most recent releases landed on October 6, 2026 and October 22, 2026 respectively.
| Parameter | System Designer | Directional Well Survey |
|---|---|---|
| Price | Free — better | $14.99 |
| Rating | 4.4 (17 ratings) — better | — |
| Positive reviews | 77.8% of reviews | — |
| Number of ratings | 17 — better | — |
| Update frequency | Monthly — better | Every 18 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | — |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 15.6 | 11.0 — better |
| Further details — not scored | ||
| Size | 7 MB | 10 MB |
| Age rating | 4+ | 4+ |
| Developer | Erwan Carriou | Carlos Moura |
In-app purchases
System Designer
No in-app purchases
Directional Well Survey
No in-app purchases
Questions
Is System Designer free?
Is Directional Well Survey free?
Do System Designer or Directional Well Survey have ads?
Which is updated more often, System Designer or Directional Well Survey?
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