# Rule It Out! vs Prime Not Prime

The clearest difference is price: Prime Not Prime at Free against Rule It Out!'s $0.99. Prime Not Prime also leads on update cadence (monthly vs every 35 months). Rule It Out!'s advantage is rating (5.0 vs 4.3) and device support (3 vs 1). On review sentiment, ratings volume, ads and in-app purchases there is nothing between them.

Prime Not Prime is free to download; Rule It Out! costs $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Rule It Out! holds the better App Store score, 5.0 against 4.3. Both are backed by a comparable volume of ratings — 6 and 6 respectively. Written reviews split almost evenly too, at 100% and 100% positive.

Rule It Out! ships an update every 35 months, Prime Not Prime monthly. The most recent releases landed on November 1, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | Rule It Out! | Prime Not Prime |
| --- | --- | --- |
| Price | $0.99 | **Free** |
| Rating | **[5.0 (6 ratings)](https://appshunter.io/ios/app/rule-it-out/id939725832/reviews)** | [4.3 (6 ratings)](https://appshunter.io/ios/app/prime-not-prime/id6738664674/reviews) |
| Number of ratings | 6 | 6 |
| Positive reviews | 100.0% of reviews | 100.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 35 months | **Monthly** |
| Monetization | Paid | **Free** |
| Size | 39 MB | 15 MB |
| Requires iOS | **14.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [appikiko LLC](https://appshunter.io/developer/448250802) | [Richard Witherspoon](https://appshunter.io/developer/1690898003) |

## What reviewers say

### Rule It Out!

[App page](https://appshunter.io/ios/app/rule-it-out/id939725832)

Challenge your mental math skills with this fast-paced game. Sort numbers based on given rules, from simple multiplication to complex exponents and fractions. Catch bonus boosts and unlock expert moves for high scores.

**Highlights:** Mental math challenges, Rule-based number sorting, Times tables practice, Fractions and decimals, Bonus boosts, Expert power moves

**Features:** macOS Compatibility

**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 Rule It Out! free?

Rule It Out! costs $0.99, 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, Rule It Out! or Prime Not Prime?

Rule It Out! is rated higher. Rule It Out! averages 5.0 out of 5 from 6 ratings, while Prime Not Prime averages 4.3 from 6 ratings.

### Do Rule It Out! or Prime Not Prime have ads?

Neither Rule It Out! nor Prime Not Prime shows ads.

### Which is updated more often, Rule It Out! or Prime Not Prime?

Rule It Out! ships an update every 35 months, and Prime Not Prime monthly. Most recently, Rule It Out! was updated on November 1, 2026 and Prime Not Prime on October 30, 2026.

---

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