# Prime Rush vs Factor Tutor by ChatStick

The clearest difference is iOS requirement: Prime Rush at 17 against Factor Tutor by ChatStick's 26.0. On price and in-app purchases there is nothing between them.

Both are free to download. Prime Rush sells 1 one-off in-app purchase and Factor Tutor by ChatStick sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

## The numbers

| Metric | Prime Rush | Factor Tutor by ChatStick |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | Yes | — |
| Update frequency | Every 3 weeks | — |
| Size | 21 MB | 12 MB |
| Requires iOS | **17** | 26.0 |
| Devices | **iPhone** | — |
| Age rating | 4+ | 4+ |
| Developer | [Ayumu Izumi](https://appshunter.io/developer/1822273057) | [ChatStick Company Limited](https://appshunter.io/developer/1165816085) |

## What reviewers say

### 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 |


### Factor Tutor by ChatStick

[App page](https://appshunter.io/ios/app/factor-tutor-by-chatstick/id6760650663)

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Unlock All Features + Remove Ads | $2.99 | one-time |


## Frequently asked questions

### Is Prime Rush free?

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

### Is Factor Tutor by ChatStick free?

Factor Tutor by ChatStick 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.*