Prime Cracker vs Rectangles & Primes
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Prime Cracker
This app helps users explore the fascinating world of prime numbers. It allows you to check if a number is prime, find its factors, and discover nearby primes. You can also analyze ranges of numbers for primes and twin primes.
- Determine primality and factors
- Find prime position
- Explore nearby primes
- Check number ranges for primes
- Identify twin primes
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• Determine a number's primality, factors or prime position • Explore nearby prime numbers conveniently • Check ranges of numbers for primes and twin primes
Rectangles & Primes
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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.
Screenshots
Verdict
The clearest difference is device support: Prime Cracker at 5 against Rectangles & Primes's 3. On price, update cadence, 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
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
Prime Cracker ships an update every 2 weeks, Rectangles & Primes every 3 weeks. The most recent releases landed on September 25, 2026 and September 15, 2026 respectively.
| Parameter | Prime Cracker | Rectangles & Primes |
|---|---|---|
| Price | Free | Free |
| Rating | 4.9 (31 ratings) — better | — |
| Positive reviews | 100.0% of reviews | — |
| Number of ratings | 31 — better | — |
| Update frequency | Every 2 weeks — better | Every 3 weeks |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | — |
| Devices | iPhone, iPad, iPod, Mac, Apple Watch — better | iPhone, iPad, iPod |
| Requires iOS | 15.0 | 15.0 |
| Further details — not scored | ||
| Size | 6 MB | 10 MB |
| Age rating | 4+ | 4+ |
| Developer | Sven Freitag | Johannes Charra |
In-app purchases
Prime Cracker
No in-app purchases
Rectangles & Primes
No in-app purchases
Questions
Is Prime Cracker free?
Is Rectangles & Primes free?
Do Prime Cracker or Rectangles & Primes have ads?
Which is updated more often, Prime Cracker or Rectangles & Primes?
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