# 小爱口算 vs Sobo Math

The clearest difference is update cadence: Sobo Math at every 3 days against 小爱口算's fortnightly. Sobo Math also leads on iOS requirement (15.0 vs 18.5). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. 小爱口算 sells 1 one-off in-app purchase 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.

小爱口算 ships an update fortnightly, Sobo Math every 3 days. The most recent releases landed on September 8, 2026 and September 20, 2026 respectively.

## The numbers

| Metric | 小爱口算 | Sobo Math |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Fortnightly | **Every 3 days** |
| Size | 1 MB | 37 MB |
| Requires iOS | 18.5 | **15.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [功亮 张](https://appshunter.io/developer/1826484363) | [kwok wai yeung](https://appshunter.io/developer/1887192726) |

## What reviewers say

### 小爱口算

[App page](https://appshunter.io/ios/app/id6748607355)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium Membership | $0.99 | 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 小爱口算 free?

小爱口算 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 小爱口算 or Sobo Math have ads?

Neither 小爱口算 nor Sobo Math shows ads.

### Which is updated more often, 小爱口算 or Sobo Math?

小爱口算 ships an update fortnightly, and Sobo Math every 3 days. Most recently, 小爱口算 was updated on September 8, 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.*