# Touch Trigonometry vs Derivative Master by ChatStick

The clearest difference is ads: Touch Trigonometry at none against Derivative Master by ChatStick's shown. Touch Trigonometry also leads on iOS requirement (15.1 vs 26.2). On price, in-app purchases and device support there is nothing between them.

Both are free to download. Touch Trigonometry sells 1 one-off in-app purchase and Derivative Master by ChatStick sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

## The numbers

| Metric | Touch Trigonometry | Derivative Master by ChatStick |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | **No** | Yes |
| Size | 48 MB | 10 MB |
| Requires iOS | **15.1** | 26.2 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Aisatsu LLC](https://appshunter.io/developer/1874553323) | [ChatStick Company Limited](https://appshunter.io/developer/1165816085) |

## What reviewers say

### Touch Trigonometry

[App page](https://appshunter.io/ios/app/touch-trigonometry/id6758712159)

**Features:** macOS Compatibility, Family Sharing

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Touch Trigonometry | $4.99 | one-time |


### Derivative Master by ChatStick

[App page](https://appshunter.io/ios/app/derivative-master-by-chatstick/id6770905531)

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

**In-app purchases (1)**

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


## Frequently asked questions

### Is Touch Trigonometry free?

Touch Trigonometry is free to download, with in-app purchases available.

### Is Derivative Master by ChatStick free?

Derivative Master by ChatStick is free to download, with in-app purchases available.

### Do Touch Trigonometry or Derivative Master by ChatStick have ads?

Derivative Master by ChatStick shows ads; Touch Trigonometry does not.

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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.*