Prime Not Prime vs Collatz Explorer
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Prime Not Prime
A fast-paced game that combines number recognition with a swiping mechanic. Players swipe right for prime numbers and left for non-primes, aiming to build long streaks. It's designed to be both educational and entertaining, with leaderboards for competitive play.
- Addictive swiping gameplay
- Test prime number knowledge
- Build streaks and complete challenges
- Global leaderboards
- Vibrant visuals and animations
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Ready to swipe your way to prime number mastery? Prime Not Prime is the fun, fast-paced game where math meets swiping! Like Tinder for numbers, you swipe right for primes and left for everything else. Easy to learn, but can you handle the streak pressure? Features You’ll Love: • Addictive Swiping Gameplay: Swipe numbers left or right in a race against time. • Test Your Knowledge: Spot prime numbers and learn fun math facts. • Streaks and Challenges: Compete to see how long you can keep your streak alive. • Leaderboards: Challenge friends and global players to see who’s the prime master. • Widgets: Guess your prime numbers right from your Home Screen. • Fun Design: Vibrant visuals and satisfying animations make every swipe exciting. Whether you’re a math whiz or just love a challenge, Prime Not Prime is the ultimate game for your brain. Swipe, learn, and have fun with prime numbers! Privacy Policy & Terms: https://www.rspoon3.com/prime-not-prime/privacy/
Collatz Explorer
Explore mathematical sequences with this app. It calculates the standard Collatz sequence for any number you enter and can also display sequences from an alternative 3x-1 function.
- Calculate Collatz sequences
- Calculate 3x-1 function sequences
- Input any number
- Visualize sequences
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A fun app that is capable of showing you any collatz sequence for a number that you input. Also capable of showing you any sequence from an alternate 3x-1 function for any number you input.
Screenshots
Verdict
The clearest difference is rating: Collatz Explorer at 4.6 against Prime Not Prime's 4.3. On price, review sentiment, ratings volume and update cadence 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.
Collatz Explorer holds the better App Store score, 4.6 against 4.3. Both are backed by a comparable volume of ratings — 6 and 7 respectively. Written reviews split almost evenly too, at 100% and 100% positive.
Both ship on a similar rhythm, roughly monthly. The most recent releases landed on September 25, 2026 and September 27, 2026 respectively.
| Parameter | Prime Not Prime | Collatz Explorer |
|---|---|---|
| Price | Free | Free |
| Rating | 4.3 (6 ratings) | 4.6 (7 ratings) — better |
| Positive reviews | 100.0% of reviews | 100.0% of reviews |
| Number of ratings | 6 | 7 — better |
| Update frequency | Monthly | Monthly |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone | iPhone |
| Requires iOS | 17.0 — better | 18.6 |
| Further details — not scored | ||
| Size | 15 MB | 1 MB |
| Age rating | 4+ | 4+ |
| Developer | Richard Witherspoon | Berk Sucu |
Customer experience
Prime Not Prime
Collatz Explorer
In-app purchases
Prime Not Prime
No in-app purchases
Collatz Explorer
No in-app purchases
Questions
Is Prime Not Prime free?
Is Collatz Explorer free?
Which has better reviews, Prime Not Prime or Collatz Explorer?
Do Prime Not Prime or Collatz Explorer have ads?
Which is updated more often, Prime Not Prime or Collatz Explorer?
Other comparisons
