# Errolux DSE數學錯題簿 vs Answell

The clearest difference is ads: Errolux DSE數學錯題簿 at none against Answell's shown. Errolux DSE數學錯題簿 also leads on update cadence (daily vs every 4 days). On price, in-app purchases, device support and iOS requirement there is nothing between them.

Both are free to download. Errolux DSE數學錯題簿 sells 3 in-app purchases, starting at $4.99 per month and Answell sells 2 in-app purchases, starting at $3.99 per month. Whichever you choose, the download price is not the number that matters.

Errolux DSE數學錯題簿 ships an update daily, Answell every 4 days. The most recent releases landed on October 30, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | Errolux DSE數學錯題簿 | Answell |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | **No** | Yes |
| Update frequency | **Daily** | Every 4 days |
| Size | 62 MB | 141 MB |
| Requires iOS | **15.0.0** | 15.1 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Kin Wai NG](https://appshunter.io/developer/1848593790) | [KAM CHEUNG Wong](https://appshunter.io/developer/1439158011) |

## What reviewers say

### Errolux DSE數學錯題簿

[App page](https://appshunter.io/ios/app/errolux-dse/id6754518544)

**Features:** macOS Compatibility

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Errolux Pro - Monthly Subscription | $4.99 | per month |
| Errolux Pro - Annual Subscription | $34.99 | per year |
| Errolux Pro User | $69.99 | one-time |


### Answell

[App page](https://appshunter.io/ios/app/answell/id6765916859)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Answell Pro (Monthly) | $3.99 | per month |
| Answell Pro (Yearly) | $34.99 | per year |


## Frequently asked questions

### Is Errolux DSE數學錯題簿 free?

Errolux DSE數學錯題簿 is free to download, with in-app purchases available.

### Is Answell free?

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

### Do Errolux DSE數學錯題簿 or Answell have ads?

Answell shows ads; Errolux DSE數學錯題簿 does not.

### Which is updated more often, Errolux DSE數學錯題簿 or Answell?

Errolux DSE數學錯題簿 ships an update daily, and Answell every 4 days. Most recently, Errolux DSE數學錯題簿 was updated on October 30, 2026 and Answell on October 31, 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.*