Comparison

System Designer vs myTextViewer

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

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.

Highlights
  • UML-based system modeling
  • Code skeleton generation
  • Graphical component creation
  • MSON format for model definition
  • Dynamic type checking
  • Cross-device synchronization via GitHub
Features
Read full description

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.

About

myTextViewer

Instantly open and view any text, code, or log file. This app offers professional syntax highlighting and line numbers, making it ideal for professionals who need to access and read various file formats on the go. It supports numerous common file types and provides customizable viewing themes.

Highlights
  • Open any text, code, or log file
  • Syntax highlighting for common formats
  • Line numbers display
  • Light and dark viewing themes
  • Share option integration
Features
Read full description

Open any text, code, or log file instantly. myTextViewer provides professional syntax highlighting and line numbers for professionals on the go. Did you recently get an email with a text file that you could not open? Was it because the format of the file doesn't fit any app that you have installed? Search no more - myTextViewer allows you to open any of these files in a text viewer. Simple, fast, easy, as 1 2 3! Just: 1. Click on a file (from the downloads/Files app) or an attachment (from email apps) 2. Using the Share option, select myTextViewer as the target app. 3. View your file Even better - It can color most common files/source code formats (python, c#, yaml, json, and much more!), so even if the default viewer can show you the text, you'll still get much more from opening files with myTextViewer. Also included: ・Light/Dark text viewing themes ・Show/Hide line numbers Enjoy!

Screenshots

System Designer3 screens
myTextViewer3 screens

Verdict

The call

The clearest difference is rating: System Designer at 4.4 against myTextViewer's 3.7. System Designer also leads on update cadence (monthly vs every 12 months) and review sentiment (78% vs 54%). myTextViewer's advantage is ratings volume (156 vs 17). 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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

System Designer holds the better App Store score, 4.4 against 3.7. That said, the two scores are not equally well evidenced: myTextViewer has 156 ratings behind it against 17, so its average is the more settled of the two. Written reviews point the same way: 78% of System Designer's written reviews are positive against 54% of myTextViewer's.

UpkeepUpdate frequency

System Designer ships an update monthly, myTextViewer every 12 months. The most recent releases landed on September 18, 2026 and September 9, 2026 respectively.

Scorecard4 real differences · 6 level
System Designer versus myTextViewer: the parameters behind the verdict, then further details
ParameterSystem DesignermyTextViewer
PriceFreeFree
Rating4.4 (17 ratings) — better3.7 (156 ratings)
Positive reviews77.8% of reviews — better54.0% of reviews
Number of ratings17156 — better
Update frequencyMonthly — betterEvery 12 months
AdsNoNo
In-app purchasesNoNo
MonetizationFreeFree
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS15.615.6
Further details — not scored
Size7 MB6 MB
Age rating4+4+
DeveloperErwan CarriouYaniv Kalsky

Customer experience

System Designer

All ratings17 ratings
Positive88.2%
Neutral0.0%
Negative11.8%
Written reviews9 reviews
Positive77.8%
Neutral0.0%
Negative22.2%

myTextViewer

All ratings156 ratings
Positive64.1%
Neutral12.2%
Negative23.7%
Written reviews87 reviews
Positive54.0%
Neutral6.9%
Negative39.1%

Bugs and requests

System Designer

Not enough reviews yet to summarise bugs or requests.

myTextViewer

Reported bugs

8 issues
  • App fails to open files from Files app
  • JSON files display blank
  • XML files not rendering properly
  • App crashes or won't launch
  • Incompatibility with iOS 14 and iOS 16
Show 3 more
  • Text files cannot be opened
  • Help screen appears instead of file content
  • No response when sharing files to app

Requested features

7 requests
  • Search/find function within documents
  • File editing capabilities
  • Remove ads or ad-free option
  • Support for action extensions
  • Better file import options
Show 2 more
  • Plain English display instead of code format
  • Export functionality

In-app purchases

None

System Designer

No in-app purchases

None

myTextViewer

No in-app purchases

Questions

Is System Designer free?
System Designer is free to download, with no in-app purchases.
Is myTextViewer free?
myTextViewer is free to download, with no in-app purchases.
Which has better reviews, System Designer or myTextViewer?
System Designer is rated higher. System Designer averages 4.4 out of 5 from 17 ratings, while myTextViewer averages 3.7 from 156 ratings.
Do System Designer or myTextViewer have ads?
Neither System Designer nor myTextViewer shows ads.
Which is updated more often, System Designer or myTextViewer?
System Designer ships an update monthly, and myTextViewer every 12 months. Most recently, System Designer was updated on September 18, 2026 and myTextViewer on September 9, 2026.

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