# Derivative Master by ChatStick vs Qedra

The clearest difference is in-app purchases: Qedra at none against Derivative Master by ChatStick's 1. Qedra also leads on iOS requirement (18.0 vs 26.2). On price, ads and device support there is nothing between them.

Both are free to download. Derivative Master by ChatStick sells 1 one-off in-app purchase. Qedra asks for nothing beyond the download.

## The numbers

| Metric | Derivative Master by ChatStick | Qedra |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | Yes | Yes |
| Update frequency | — | Every 2 weeks |
| Size | 10 MB | 23 MB |
| Requires iOS | 26.2 | **18.0** |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [ChatStick Company Limited](https://appshunter.io/developer/1165816085) | [Matthew Wong](https://appshunter.io/developer/6774040057) |

## What reviewers say

### 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 |


### Qedra

[App page](https://appshunter.io/ios/app/qedra-math-solver/id6803934326)

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

**In-app purchases:** none


## Frequently asked questions

### Is Derivative Master by ChatStick free?

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

### Is Qedra free?

Qedra is free to download, with no in-app purchases.

### Do Derivative Master by ChatStick or Qedra have ads?

Both Derivative Master by ChatStick and Qedra show ads.

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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.*