# Class問答(家教版) vs Prime Rush

The clearest difference is in-app purchases: Class問答(家教版) at none against Prime Rush's 1. Class問答(家教版) also leads on iOS requirement (13.0 vs 17). Prime Rush's advantage is update cadence (every 3 weeks vs every 22 months). On price there is nothing between them.

Both are free to download. Prime Rush sells 1 one-off in-app purchase. Class問答(家教版) asks for nothing beyond the download.

Class問答(家教版) ships an update every 22 months, Prime Rush every 3 weeks. The most recent releases landed on October 10, 2026 and September 29, 2026 respectively.

## The numbers

| Metric | Class問答(家教版) | Prime Rush |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | — | Yes |
| Update frequency | Every 22 months | **Every 3 weeks** |
| Size | 52 MB | 21 MB |
| Requires iOS | **13.0** | 17 |
| Devices | — | **iPhone** |
| Age rating | 4+ | 4+ |
| Developer | [克雷斯班級網股份有限公司](https://appshunter.io/developer/1687441907) | [Ayumu Izumi](https://appshunter.io/developer/1822273057) |

## What reviewers say

### Class問答(家教版)

[App page](https://appshunter.io/ios/app/class/id6449015702)

**In-app purchases:** none


### Prime Rush

[App page](https://appshunter.io/ios/app/prime-rush-math-time-attack/id6755986782)

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro Plan | $1.99 | one-time |


## Frequently asked questions

### Is Class問答(家教版) free?

Class問答(家教版) is free to download, with no in-app purchases.

### Is Prime Rush free?

Prime Rush is free to download, with in-app purchases available.

### Which is updated more often, Class問答(家教版) or Prime Rush?

Class問答(家教版) ships an update every 22 months, and Prime Rush every 3 weeks. Most recently, Class問答(家教版) was updated on October 10, 2026 and Prime Rush on September 29, 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.*