# 自我挑戰獎勵計劃 vs Sobo Math

The clearest difference is in-app purchases: 自我挑戰獎勵計劃 at none against Sobo Math's 2. 自我挑戰獎勵計劃 also leads on iOS requirement (12.0 vs 15.0). Sobo Math's advantage is update cadence (every 3 days vs every 2 months). On price, ads and device support there is nothing between them.

Both are free to download. Sobo Math sells 2 in-app purchases, starting at $9.99 per month. 自我挑戰獎勵計劃 asks for nothing beyond the download.

自我挑戰獎勵計劃 ships an update every 2 months, Sobo Math every 3 days. The most recent releases landed on October 14, 2026 and October 7, 2026 respectively.

## The numbers

| Metric | 自我挑戰獎勵計劃 | Sobo Math |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 3 days** |
| Size | 105 MB | 28 MB |
| Requires iOS | **12.0** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Big Dipper Studio](https://appshunter.io/developer/962643670) | [kwok wai yeung](https://appshunter.io/developer/1887192726) |

## What reviewers say

### 自我挑戰獎勵計劃

[App page](https://appshunter.io/ios/app/id1546065745)

**Features:** macOS Compatibility

**In-app purchases:** none


### 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 自我挑戰獎勵計劃 free?

自我挑戰獎勵計劃 is free to download, with no in-app purchases.

### Is Sobo Math free?

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

### Do 自我挑戰獎勵計劃 or Sobo Math have ads?

Neither 自我挑戰獎勵計劃 nor Sobo Math shows ads.

### Which is updated more often, 自我挑戰獎勵計劃 or Sobo Math?

自我挑戰獎勵計劃 ships an update every 2 months, and Sobo Math every 3 days. Most recently, 自我挑戰獎勵計劃 was updated on October 14, 2026 and Sobo Math on October 7, 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.*