# Prime Factors vs Memorize Prime Numbers

The clearest difference is rating: Prime Factors at 3.9 against Memorize Prime Numbers's 3.0. Prime Factors also leads on ads (none vs shown) and review sentiment (79% vs 50%). Memorize Prime Numbers's advantage is update cadence (every 10 months vs every 21 months) and iOS requirement (15.6 vs 18.0). On in-app purchases and device support there is nothing between them.

Prime Factors costs $0.99 and Memorize Prime Numbers $4.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Prime Factors holds the better App Store score, 3.9 against 3.0. That said, the two scores are not equally well evidenced: Prime Factors has 24 ratings behind it against 2, so its average is the more settled of the two. Written reviews point the same way: 79% of Prime Factors's written reviews are positive against 50% of Memorize Prime Numbers's.

Prime Factors ships an update every 21 months, Memorize Prime Numbers every 10 months. The most recent releases landed on September 10, 2026 and September 19, 2026 respectively.

## The numbers

| Metric | Prime Factors | Memorize Prime Numbers |
| --- | --- | --- |
| Price | **$0.99** | $4.99 |
| Rating | **[3.9 (24 ratings)](https://appshunter.io/ios/app/prime-factors/id741746948/reviews)** | [3.0 (2 ratings)](https://appshunter.io/ios/app/memorize-prime-numbers/id6475699754/reviews) |
| Number of ratings | **24** | 2 |
| Positive reviews | **78.6% of reviews** | 50.0% of reviews |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | Every 21 months | **Every 10 months** |
| Monetization | **Free** | Ad-supported |
| Size | 1 MB | 53 MB |
| Requires iOS | 18.0 | **15.6** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Paul Hangas](https://appshunter.io/developer/433121902) | [Oscar Tsang](https://appshunter.io/developer/416987065) |

## What reviewers say

### Prime Factors

[App page](https://appshunter.io/ios/app/prime-factors/id741746948)

Explore numbers up to one trillion, with primes clearly marked. Tap any number to reveal its prime factors. Easily navigate to specific numbers using the search function and adjust the display with pinch-to-zoom gestures.

**Highlights:** View numbers up to 1 trillion, Prime numbers highlighted, Tap for prime factors, Search for specific numbers, Pinch and zoom display

**Features:** macOS Compatibility

**In-app purchases:** none


### Memorize Prime Numbers

[App page](https://appshunter.io/ios/app/memorize-prime-numbers/id6475699754)

Learn to memorize hundreds of prime numbers within a week using a provided method. This app offers a unique approach to remembering these special numbers.

**Highlights:** Memorize hundreds of prime numbers, Learn a provided memorization method, Focus on prime number recall, Suitable for quick learning

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

**In-app purchases:** none


## Frequently asked questions

### Is Prime Factors free?

Prime Factors costs $0.99, with no in-app purchases.

### Is Memorize Prime Numbers free?

Memorize Prime Numbers costs $4.99, with no in-app purchases.

### Which has better reviews, Prime Factors or Memorize Prime Numbers?

Prime Factors is rated higher. Prime Factors averages 3.9 out of 5 from 24 ratings, while Memorize Prime Numbers averages 3.0 from 2 ratings.

### Do Prime Factors or Memorize Prime Numbers have ads?

Memorize Prime Numbers shows ads; Prime Factors does not.

### Which is updated more often, Prime Factors or Memorize Prime Numbers?

Prime Factors ships an update every 21 months, and Memorize Prime Numbers every 10 months. Most recently, Prime Factors was updated on September 10, 2026 and Memorize Prime Numbers on September 19, 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.*