ProbSim vs Rectangles & Primes
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
ProbSim
Simulate probability experiments with various tools like coins, dice, and spinners. Test your predictions against experimental results and tackle challenging probability problems.
- Probability experiment simulation
- Coin flipping
- Dice rolling
- Spinner manipulation
- Marble drawing from urns
- Predictive testing
- Problem-solving challenges
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ProbSim is a probability experiment simulator. You can tag fish, flip coins, roll dice, spin spinners, and draw marbles from urns. Predict the probability of a certain outcome, and see whether or not your prediction is supported by the experimental results. ProbSim also challenges you to solve some tricky and easily misunderstood probability problems involving birthdays, game shows, envelopes, coins, hats, urns, and apparent paradoxes.
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.
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Verdict
The clearest difference is update cadence: Rectangles & Primes at every 3 weeks against ProbSim's every 40 months. Rectangles & Primes also leads on device support (3 vs 1). ProbSim's advantage is iOS requirement (8.0 vs 15.0). 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
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
ProbSim ships an update every 40 months, Rectangles & Primes every 3 weeks. The most recent releases landed on October 24, 2026 and October 25, 2026 respectively.
| Parameter | ProbSim | Rectangles & Primes |
|---|---|---|
| Price | Free | Free |
| Positive reviews | 0.0% of reviews | — |
| Update frequency | Every 40 months | Every 3 weeks — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | — |
| Devices | iPad | iPhone, iPad, iPod — better |
| Requires iOS | 8.0 — better | 15.0 |
| Further details — not scored | ||
| Size | 29 MB | 10 MB |
| Age rating | 4+ | 4+ |
| Developer | Thomas Bretl | Johannes Charra |
In-app purchases
ProbSim
No in-app purchases
Rectangles & Primes
No in-app purchases
Questions
Is ProbSim free?
Is Rectangles & Primes free?
Do ProbSim or Rectangles & Primes have ads?
Which is updated more often, ProbSim or Rectangles & Primes?
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