# 知无涯掌上课堂 vs Sobo Math

The clearest difference is device support: Sobo Math at 3 against 知无涯掌上课堂's —. 知无涯掌上课堂's advantage is iOS requirement (13.0 vs 15.0). On price and in-app purchases there is nothing between them.

Both are free to download. 知无涯掌上课堂 sells 4 one-off in-app purchases 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.

## The numbers

| Metric | 知无涯掌上课堂 | Sobo Math |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | — | No |
| Update frequency | — | Every 3 days |
| Size | 21 MB | 28 MB |
| Requires iOS | **13.0** | 15.0 |
| Devices | — | **iPhone, iPad, iPod** |
| Age rating | 17+ | 4+ |
| Developer | [Beijing Haoran Yuanda Education Technology Co., Ltd.](https://appshunter.io/developer/957289666) | [kwok wai yeung](https://appshunter.io/developer/1887192726) |

## What reviewers say

### 知无涯掌上课堂

[App page](https://appshunter.io/ios/app/id6450402705)

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 2024考研西医临 床医学综合基础精讲班 | $0.99 | one-time |
| 2024考研思想政治理论基础精讲班 | $0.99 | one-time |
| 2024考研英语基础精讲班 | $0.99 | one-time |
| 2024考研中医临床医学综合基础精讲班 | $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 知无涯掌上课堂 free?

知无涯掌上课堂 is free to download, with in-app purchases available.

### Is Sobo Math free?

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

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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.*