# 易错词库 vs Math 24

The clearest difference is in-app purchases: Math 24 at none against 易错词库's 1. 易错词库's advantage is update cadence (every 11 days vs every 3 months). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. 易错词库 sells 1 one-off in-app purchase. Math 24 asks for nothing beyond the download.

易错词库 ships an update every 11 days, Math 24 every 3 months. The most recent releases landed on September 17, 2026 and September 1, 2026 respectively.

## The numbers

| Metric | 易错词库 | Math 24 |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 88.9% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 11 days** | Every 3 months |
| Monetization | Free with in-app purchases | — |
| Size | 10 MB | 26 MB |
| Requires iOS | 16.6 | 16.6 |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [尧 魏](https://appshunter.io/developer/1658434412) | [娟 秦](https://appshunter.io/developer/1493246128) |

## What reviewers say

### 易错词库

[App page](https://appshunter.io/ios/app/id6450763094)

This app helps students eliminate errors in Chinese characters, pinyin, and idioms. It offers a comprehensive dictionary of commonly mistaken words and provides learning materials from educational websites to boost Chinese language proficiency for exams.

**Highlights:** 3000+ common error words dictionary, Curated educational materials, High-frequency updates, Authoritative dictionary definitions, Save and favorite words for review

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| VIP 服务 | $0.99 | one-time |


### Math 24

[App page](https://appshunter.io/ios/app/math-24-handwriting-solver/id6761042126)

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

**In-app purchases:** none


## Frequently asked questions

### Is 易错词库 free?

易错词库 is free to download, with in-app purchases available.

### Is Math 24 free?

Math 24 is free to download, with no in-app purchases.

### Do 易错词库 or Math 24 have ads?

Neither 易错词库 nor Math 24 shows ads.

### Which is updated more often, 易错词库 or Math 24?

易错词库 ships an update every 11 days, and Math 24 every 3 months. Most recently, 易错词库 was updated on September 17, 2026 and Math 24 on September 1, 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.*