# 好補寶 x 改簿寶 vs Sobo Math

The clearest difference is iOS requirement: Sobo Math at 15.0 against 好補寶 x 改簿寶's 17.0. On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. 好補寶 x 改簿寶 sells 5 in-app purchases, starting at $1.99 per month and Sobo Math sells 2 in-app purchases, starting at $9.99 per month. Whichever you choose, the download price is not the number that matters.

好補寶 x 改簿寶 ships an update every 2 days, Sobo Math every 3 days. The most recent releases landed on September 21, 2026 and September 20, 2026 respectively.

## The numbers

| Metric | 好補寶 x 改簿寶 | Sobo Math |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Every 2 days** | Every 3 days |
| Size | 11 MB | 37 MB |
| Requires iOS | 17.0 | **15.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [LAI Yiu Yeung](https://appshunter.io/developer/1889122713) | [kwok wai yeung](https://appshunter.io/developer/1887192726) |

## What reviewers say

### 好補寶 x 改簿寶

[App page](https://appshunter.io/ios/app/x/id6772957967)

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

**In-app purchases (5)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Plus Monthly | $1.99 | per month |
| Pro 月費 | $8.99 | per month |
| Plus Yearly | $8.99 | per year |
| Pro Yearly | $69.99 | per year |
| 50+10 Credit | $4.99 | one-time |


### Sobo Math

[App page](https://appshunter.io/ios/app/sobo-math/id6785965928)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 小學數學大冒險 | $9.99 | per month |
| PRO Yearly | $69.99 | per year |


## Frequently asked questions

### Is 好補寶 x 改簿寶 free?

好補寶 x 改簿寶 is free to download, with in-app purchases available.

### Is Sobo Math free?

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

### Do 好補寶 x 改簿寶 or Sobo Math have ads?

Neither 好補寶 x 改簿寶 nor Sobo Math shows ads.

### Which is updated more often, 好補寶 x 改簿寶 or Sobo Math?

好補寶 x 改簿寶 ships an update every 2 days, and Sobo Math every 3 days. Most recently, 好補寶 x 改簿寶 was updated on September 21, 2026 and Sobo Math on September 20, 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.*