# 错题本 vs AiUniScan

The clearest difference is update cadence: AiUniScan at every 3 days against 错题本's every 2 months. 错题本's advantage is iOS requirement (13.0 vs 15.1). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. 错题本 sells 2 in-app purchases, starting at $1.99 per month and AiUniScan sells 2 in-app purchases, starting at $9.99 per month. Whichever you choose, the download price is not the number that matters.

错题本 ships an update every 2 months, AiUniScan every 3 days. The most recent releases landed on October 16, 2026 and October 14, 2026 respectively.

## The numbers

| Metric | 错题本 | AiUniScan |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.2 (5 ratings)](https://appshunter.io/ios/app/id6448860597/reviews)** | — |
| Number of ratings | **5** | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 3 days** |
| Monetization | Freemium | — |
| Size | 46 MB | 40 MB |
| Requires iOS | **13.0** | 15.1 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 12+ |
| Developer | [深圳市美易网科技有限公司](https://appshunter.io/developer/1647736306) | [Uni-Two Relationship Advisory Inc.](https://appshunter.io/developer/1884994333) |

## What reviewers say

### 错题本

[App page](https://appshunter.io/ios/app/id6448860597)

This learning tool helps students and parents efficiently manage incorrect answers from homework and tests. It uses advanced technology to quickly capture, organize, and review mistakes, making studying smarter and more effective.

**Highlights:** Photo capture of incorrect answers, Automatic removal of handwriting, Subject-based categorization, Detailed breakdown of questions and solutions, Custom practice test generation, Daily review for targeted learning

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 连续包月 | $1.99 | per month |
| 连续包年 | $9.99 | per year |


### AiUniScan

[App page](https://appshunter.io/ios/app/aiuniscan/id6760562272)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro Monthly | $9.99 | per month |
| Pro Yearly | $69.99 | per year |


## Frequently asked questions

### Is 错题本 free?

错题本 is free to download, with in-app purchases available.

### Is AiUniScan free?

AiUniScan is free to download, with in-app purchases available.

### Do 错题本 or AiUniScan have ads?

Neither 错题本 nor AiUniScan shows ads.

### Which is updated more often, 错题本 or AiUniScan?

错题本 ships an update every 2 months, and AiUniScan every 3 days. Most recently, 错题本 was updated on October 16, 2026 and AiUniScan on October 14, 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.*