Comparison

System Designer vs periods.

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

periods.

Features
Read full description

Read faster. Understand more. One word at a time. periods. uses RSVP (Rapid Serial Visual Presentation) to deliver text at a fixed point so your eyes stay still and your brain does the reading. Import any article, PDF, or EPUB — or paste text directly — and read it at speeds you didn't think were possible. • Adaptive pacing adjusts timing based on word length and punctuation • On-device comprehension checks powered by Apple Intelligence • Focus Score tracks consistency, endurance, and speed over time • Daily challenge with a fresh passage every day • Reading streaks and detailed stats • Dark mode with a warm, comfortable palette • No accounts required — works offline, everything stays on your device Start at 300 words per minute. Push from there.

Screenshots

System Designer3 screens
periods.4 screens

Verdict

The call

The clearest difference is device support: System Designer at 3 against periods.'s 1. System Designer also leads on iOS requirement (15.6 vs 26.2). On price, ads and in-app purchases 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.

Scorecard2 real differences · 8 level
System Designer versus periods.: the parameters behind the verdict, then further details
ParameterSystem Designerperiods.
PriceFreeFree
Rating4.4 (17 ratings) — better—
Positive reviews77.8% of reviews—
Number of ratings17 — better—
Update frequencyMonthly—
AdsNoNo
In-app purchasesNoNo
MonetizationFree—
DevicesiPhone, iPad, iPod — betteriPhone
Requires iOS15.6 — better26.2
Further details — not scored
Size7 MB2 MB
Age rating4+4+
DeveloperErwan CarriouJordan Eromonsele

In-app purchases

None

System Designer

No in-app purchases

None

periods.

No in-app purchases

Questions

Is System Designer free?
System Designer is free to download, with no in-app purchases.
Is periods. free?
periods. is free to download, with no in-app purchases.
Do System Designer or periods. have ads?
Neither System Designer nor periods. shows ads.

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