Comparison

Rectangles & Primes vs 2s Complement Calculator

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

Head to head
About

Rectangles & Primes

Features
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Rectangle provides a fun and insightful maths experience for kids aged 6 to 12. They will improve their understanding of number factorization and prime numbers.

About

2s Complement Calculator

Features
Read full description

Two’s complement calculator It is a computer and math-related application to find a special value using different numbers systems. It computes two’s complement from the values in binary, decimal, and hex systems. You will get steps as well. What is two’s complement? Two’s complement is found from the binary values of numbers. It is used in computer sciences a lot due to its many benefits like solving math problems. How to find two’s complement? Two’s complement is easy to find using the binary values. The rule is “Invert and add 1”. But the problem arises when two’s complement is required from other number systems like hex and decimal. It is then necessary to first convert them into binary numbers and then proceed. Then there is the problem of the number of bits. It is crucial to complete the bits. Hence the suitable alternative is 2’s complement calculator. How to use this application? After downloading and opening the application; 1. Select the input format i.e the number system. 2. Choose the bit size from the “Binary digits” option. 3. Enter the value in the selected number system. 4. Convert. Features This application is designed by a dedicated team of developers to meet all the requirements of users. It has some really cool features which are discussed ahead. Before reading the features, be assured that the calculations performed by this tool are hundred percent accurate. - Various number systems. Most of the applications on the Play Store and Apple store only allow conversion from the binary system. But Allmath’s 2s complement calculator has extended its field to decimal and hex systems as well. - Bit size The app allows choosing from a number of bit sizes like 4, 8, and 16. - Keyboard. You get a keyboard exclusively designed for all three number systems. It has options to enter hex alphabets and the other required digits. - Comprehensive result One thing of two’s complement application that stands out the most is its thorough result feature. The user will not only get the conversion into 2’s complement but also an account of selected and important information. Use this application and feel free to leave suggestions.

Screenshots

Rectangles & Primes2 screens
2s Complement Calculator4 screens

Verdict

The call

The clearest difference is update cadence: Rectangles & Primes at every 3 weeks against 2s Complement Calculator's every 15 months. 2s Complement Calculator's advantage is iOS requirement (13.0 vs 15.0). On price, 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

CostPrice · In-app purchases · Ads · Monetization

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

UpkeepUpdate frequency

Rectangles & Primes ships an update every 3 weeks, 2s Complement Calculator every 15 months. Both last shipped on November 7, 2026.

Scorecard2 real differences · 4 level
Rectangles & Primes versus 2s Complement Calculator: the parameters behind the verdict, then further details
ParameterRectangles & Primes2s Complement Calculator
PriceFreeFree
Update frequencyEvery 3 weeks — betterEvery 15 months
AdsNoNo
In-app purchasesNoNo
DevicesiPhone, iPad, iPod — betteriPhone, iPod
Requires iOS15.013.0 — better
Further details — not scored
Size10 MB17 MB
Age rating4+4+
DeveloperJohannes CharraAhmad Sattar

In-app purchases

None

Rectangles & Primes

No in-app purchases

None

2s Complement Calculator

No in-app purchases

Questions

Is Rectangles & Primes free?
Rectangles & Primes is free to download, with no in-app purchases.
Is 2s Complement Calculator free?
2s Complement Calculator is free to download, with no in-app purchases.
Do Rectangles & Primes or 2s Complement Calculator have ads?
Neither Rectangles & Primes nor 2s Complement Calculator shows ads.
Which is updated more often, Rectangles & Primes or 2s Complement Calculator?
Rectangles & Primes ships an update every 3 weeks, and 2s Complement Calculator every 15 months. Most recently, Rectangles & Primes was updated on November 7, 2026 and 2s Complement Calculator on November 7, 2026.

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