# Memorize Prime Numbers vs MistakeBook

The clearest difference is review sentiment: MistakeBook at 100% against Memorize Prime Numbers's 50%. MistakeBook also leads on ads (none vs shown) and update cadence (monthly vs every 14 months). Memorize Prime Numbers's advantage is price (Free vs $1.99). On in-app purchases and device support there is nothing between them.

Memorize Prime Numbers is free to download; MistakeBook costs $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Memorize Prime Numbers ships an update every 14 months, MistakeBook monthly. The most recent releases landed on October 25, 2026 and October 28, 2026 respectively.

## The numbers

| Metric | Memorize Prime Numbers | MistakeBook |
| --- | --- | --- |
| Price | **Free** | $1.99 |
| Rating | **[3.0 (2 ratings)](https://appshunter.io/ios/app/memorize-prime-numbers/id6475699754/reviews)** | — |
| Number of ratings | **2** | — |
| Positive reviews | 50.0% of reviews | **100.0% of reviews** |
| In-app purchases | No | No |
| Ads | Yes | **No** |
| Update frequency | Every 14 months | **Monthly** |
| Monetization | **Ad-supported** | Paid |
| Best chart rank | — | **#197** |
| Size | 84 MB | 26 MB |
| Requires iOS | 16.6 | **13.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | +4 |
| Developer | [Oscar Tsang](https://appshunter.io/developer/416987065) | [Xiamen City Fanyou Network Technology Co., Ltd.](https://appshunter.io/developer/1842524161) |

## What reviewers say

### 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


### MistakeBook

[App page](https://appshunter.io/ios/app/mistakebook-wrong-answer-log/id6770173206)

**Currently charting:** #197 Top Paid · Education (US App Store)

Log and review incorrect answers to improve learning. Organize mistakes by subject and topic, and utilize spaced repetition to reinforce weak areas. Track progress with visual charts and daily check-ins for effective test preparation.

**Highlights:** Log mistakes with photos and notes, Organize by subject and custom tags, Spaced repetition review mode, Ebbinghaus forgetting curve schedule, Progress charts and stats dashboard, Data import/export backup

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

**In-app purchases:** none


## Frequently asked questions

### Is Memorize Prime Numbers free?

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

### Is MistakeBook free?

MistakeBook costs $1.99, with no in-app purchases.

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

Memorize Prime Numbers shows ads; MistakeBook does not.

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

Memorize Prime Numbers ships an update every 14 months, and MistakeBook monthly. Most recently, Memorize Prime Numbers was updated on October 25, 2026 and MistakeBook on October 28, 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.*