# Errolux DSE數學錯題簿 vs HKDSE Math Practice & Notes

The clearest difference is update cadence: Errolux DSE數學錯題簿 at daily against HKDSE Math Practice & Notes's every 3 days. On price, ads, in-app purchases and device support 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 HKDSE Math Practice & Notes sells 2 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.

Errolux DSE數學錯題簿 ships an update daily, HKDSE Math Practice & Notes every 3 days. The most recent releases landed on October 4, 2026 and October 5, 2026 respectively.

## The numbers

| Metric | Errolux DSE數學錯題簿 | HKDSE Math Practice & Notes |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Daily** | Every 3 days |
| Size | 62 MB | 182 MB |
| Requires iOS | **15.0.0** | 15.6 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Kin Wai NG](https://appshunter.io/developer/1848593790) | [Pickmy AI](https://appshunter.io/developer/1869516043) |

## 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 |


### HKDSE Math Practice & Notes

[App page](https://appshunter.io/ios/app/hkdse-math-practice-and-notes/id6809379110)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Math Pro 180 Days | $19.99 | one-time |
| Math Pro 90 Days | $19.99 | one-time |


## 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 HKDSE Math Practice & Notes free?

HKDSE Math Practice & Notes is free to download, with in-app purchases available.

### Do Errolux DSE數學錯題簿 or HKDSE Math Practice & Notes have ads?

Neither Errolux DSE數學錯題簿 nor HKDSE Math Practice & Notes shows ads.

### Which is updated more often, Errolux DSE數學錯題簿 or HKDSE Math Practice & Notes?

Errolux DSE數學錯題簿 ships an update daily, and HKDSE Math Practice & Notes every 3 days. Most recently, Errolux DSE數學錯題簿 was updated on October 4, 2026 and HKDSE Math Practice & Notes on October 5, 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.*