# NCP vs MistakeBook

The clearest difference is price: NCP at Free against MistakeBook's $1.99. MistakeBook's advantage is update cadence (monthly vs every 3 months) and chart position (#197 vs unranked). On ads, in-app purchases and device support there is nothing between them.

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

NCP ships an update every 3 months, MistakeBook monthly. Both last shipped on October 28, 2026.

## The numbers

| Metric | NCP | MistakeBook |
| --- | --- | --- |
| Price | **Free** | $1.99 |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 months | **Monthly** |
| Monetization | — | Paid |
| Best chart rank | — | **#197** |
| Size | 27 MB | 26 MB |
| Requires iOS | 15.0 | **13.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | +4 |
| Developer | [Davy Raitt](https://appshunter.io/developer/1795318281) | [Xiamen City Fanyou Network Technology Co., Ltd.](https://appshunter.io/developer/1842524161) |

## What reviewers say

### NCP

[App page](https://appshunter.io/ios/app/ncp-genl-generative-ai-llms/id6757435643)

**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 NCP free?

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

### Is MistakeBook free?

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

### Do NCP or MistakeBook have ads?

Neither NCP nor MistakeBook shows ads.

### Which is updated more often, NCP or MistakeBook?

NCP ships an update every 3 months, and MistakeBook monthly. Most recently, NCP was updated on October 28, 2026 and MistakeBook on October 28, 2026.

---

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