Comparison

Goldbach's Conjecture vs Cabri Express Primary

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

Head to head
About

Goldbach's Conjecture

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Fun and Challenging! Goldbach's Conjecture introduces students to an idea that has baffled mathematicians for centuries. In 1742, a Russian mathematician named Christian Goldbach wrote a letter to Leonhard Euler in which he proposed a conjecture. The conjecture stated that all even numbers greater than two can be expressed as the sum of two primes. This app challenges the player to find two prime numbers to make a target even number. Completing the activity involves using mental math skills. Goldbach Conjecture is designed to be a quick math exercise that teachers can use to provide extra practice in problem solving and an enriching experience for their students. Special sound effects make the game fun to use and the interactive design facilitate problem solving strategies.

About

Cabri Express Primary

Features
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Features of Cabri Express Primary include a super easy primary calculator, geometry instruments, 2D & 3D shapes plus a dynamic geometry environment. App wrapped in an intuitive app that kids love to use. The primary version distinguishes itself from the secondary version in the look and in the calculator: the division is arithmetic (per default) and decimal numbers, fractions, roots and trigonometric functions are not made extra visible. These adjustments are the results of reviews with math education experts and with ministries of education. With its friendly interface, Cabri Express allows students to visualize and manipulate abstract mathematical concepts. The app is a laboratory in which they explore, model, and investigate without any limits. Cabri is free, it is the reference software for dynamic mathematics. It has been used for more than 25 years by millions of teachers and students around the world. Good maths for students and power & ease for teachers, to teach math not the software.

Screenshots

Cabri Express Primary4 screens

Verdict

The call

The clearest difference is price: Cabri Express Primary at Free against Goldbach's Conjecture's $0.99. Cabri Express Primary also leads on update cadence (every 2 months vs every 8 months) and device support (4 vs 2). Goldbach's Conjecture's advantage is iOS requirement (12.0 vs 14.0). On ads and in-app purchases there is nothing between them.

Scored on Price ยท Rating ยท Positive reviews ยท Number of ratings ยท Update frequency ยท Ads ยท In-app purchases ยท Monetization ยท Best chart rank ยท Devices ยท Requires iOS

CostPrice ยท In-app purchases ยท Ads ยท Monetization

Cabri Express Primary is free to download; Goldbach's Conjecture costs $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

Goldbach's Conjecture ships an update every 8 months, Cabri Express Primary every 2 months. Both last shipped on October 3, 2026.

Scorecard4 real differences ยท 2 level
Goldbach's Conjecture versus Cabri Express Primary: the parameters behind the verdict, then further details
ParameterGoldbach's ConjectureCabri Express Primary
Price$0.99Free โ€” better
Update frequencyEvery 8 monthsEvery 2 months โ€” better
AdsNoNo
In-app purchasesNoNo
DevicesiPad, MaciPhone, iPad, iPod, Mac โ€” better
Requires iOS12.0 โ€” better14.0
Further details โ€” not scored
Size34 MB101 MB
Age rating4+12+
DeveloperVentura Educational SystemsCabrilog SAS

In-app purchases

None

Goldbach's Conjecture

No in-app purchases

None

Cabri Express Primary

No in-app purchases

Questions

Is Goldbach's Conjecture free?
Goldbach's Conjecture costs $0.99, with no in-app purchases.
Is Cabri Express Primary free?
Cabri Express Primary is free to download, with no in-app purchases.
Do Goldbach's Conjecture or Cabri Express Primary have ads?
Neither Goldbach's Conjecture nor Cabri Express Primary shows ads.
Which is updated more often, Goldbach's Conjecture or Cabri Express Primary?
Goldbach's Conjecture ships an update every 8 months, and Cabri Express Primary every 2 months. Most recently, Goldbach's Conjecture was updated on October 3, 2026 and Cabri Express Primary on October 3, 2026.

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