# WorldTime vs MistakeBook

The clearest difference is price: WorldTime at Free against MistakeBook's $1.99. MistakeBook's advantage is device support and iOS requirement (13.0 vs 17.0). On in-app purchases there is nothing between them.

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

## The numbers

| Metric | WorldTime | MistakeBook |
| --- | --- | --- |
| Price | **Free** | $1.99 |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | No | No |
| Ads | — | No |
| Update frequency | — | Monthly |
| Monetization | — | Paid |
| Size | 5 MB | 26 MB |
| Requires iOS | 17.0 | **13.0** |
| Devices | — | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [CLIPPER, N.P.O.](https://appshunter.io/developer/1707154365) | [Xiamen City Fanyou Network Technology Co., Ltd.](https://appshunter.io/developer/1842524161) |

## What reviewers say

### WorldTime

[App page](https://appshunter.io/ios/app/worldtime-app/id6466277913)

**In-app purchases:** none


### MistakeBook

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

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 WorldTime free?

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

### Is MistakeBook free?

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

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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.*