# Prime Cracker vs Prime Not Prime

The clearest difference is rating: Prime Cracker at 4.9 against Prime Not Prime's 4.3. Prime Cracker also leads on ratings volume (33 vs 6) and device support (5 vs 1). On price, review sentiment, update cadence and ads there is nothing between them.

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

Prime Cracker holds the better App Store score, 4.9 against 4.3. That said, the two scores are not equally well evidenced: Prime Cracker has 33 ratings behind it against 6, so its average is the more settled of the two. Written reviews split almost evenly too, at 100% and 100% positive.

Prime Cracker ships an update every 2 weeks, Prime Not Prime monthly. Both last shipped on October 24, 2026.

## The numbers

| Metric | Prime Cracker | Prime Not Prime |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.9 (33 ratings)](https://appshunter.io/ios/app/prime-cracker/id1281280649/reviews)** | [4.3 (6 ratings)](https://appshunter.io/ios/app/prime-not-prime/id6738664674/reviews) |
| Number of ratings | **33** | 6 |
| Positive reviews | 100.0% of reviews | 100.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 2 weeks** | Monthly |
| Monetization | Free | Free |
| Size | 6 MB | 15 MB |
| Requires iOS | **15.0** | 17.0 |
| Devices | **iPhone, iPad, iPod, Mac, Apple Watch** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Sven Freitag](https://appshunter.io/developer/1281280648) | [Richard Witherspoon](https://appshunter.io/developer/1690898003) |

## What reviewers say

### Prime Cracker

[App page](https://appshunter.io/ios/app/prime-cracker/id1281280649)

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.

**Highlights:** Determine primality and factors, Find prime position, Explore nearby primes, Check number ranges for primes, Identify twin primes

**In-app purchases:** none


### Prime Not Prime

[App page](https://appshunter.io/ios/app/prime-not-prime/id6738664674)

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.

**Highlights:** Addictive swiping gameplay, Test prime number knowledge, Build streaks and complete challenges, Global leaderboards, Vibrant visuals and animations

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Prime Cracker free?

Prime Cracker is free to download, with no in-app purchases.

### Is Prime Not Prime free?

Prime Not Prime is free to download, with no in-app purchases.

### Which has better reviews, Prime Cracker or Prime Not Prime?

Prime Cracker is rated higher. Prime Cracker averages 4.9 out of 5 from 33 ratings, while Prime Not Prime averages 4.3 from 6 ratings.

### Do Prime Cracker or Prime Not Prime have ads?

Neither Prime Cracker nor Prime Not Prime shows ads.

### Which is updated more often, Prime Cracker or Prime Not Prime?

Prime Cracker ships an update every 2 weeks, and Prime Not Prime monthly. Most recently, Prime Cracker was updated on October 24, 2026 and Prime Not Prime on October 24, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*