# CrystalGen vs Derivative

The clearest difference is update cadence: Derivative at monthly against CrystalGen's every 38 months. Derivative also leads on price ($1.99 vs $2.99) and iOS requirement (15.1 vs 17.2). On ads, in-app purchases and device support there is nothing between them.

CrystalGen costs $2.99 and Derivative $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.

CrystalGen ships an update every 38 months, Derivative monthly. The most recent releases landed on November 30, 2025 and August 16, 2026 respectively.

## The numbers

| Metric | CrystalGen | Derivative |
| --- | --- | --- |
| Price | $2.99 | **$1.99** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 38 months | **Monthly** |
| Size | 3 MB | 32 MB |
| Requires iOS | 17.2 | **15.1** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Steve Kliewer](https://appshunter.io/developer/1255655631) | [Om Prakash Chapagain](https://appshunter.io/developer/1618620262) |

## What reviewers say

### CrystalGen

[App page](https://appshunter.io/ios/app/crystalgen/id1589074466)

**Features:** macOS Compatibility

**In-app purchases:** none


### Derivative

[App page](https://appshunter.io/ios/app/derivative-calculus-pro/id1618965619)

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

**In-app purchases:** none


## Frequently asked questions

### Is CrystalGen free?

CrystalGen costs $2.99, with no in-app purchases.

### Is Derivative free?

Derivative costs $1.99, with no in-app purchases.

### Do CrystalGen or Derivative have ads?

Neither CrystalGen nor Derivative shows ads.

### Which is updated more often, CrystalGen or Derivative?

CrystalGen ships an update every 38 months, and Derivative monthly. Most recently, CrystalGen was updated on November 30, 2025 and Derivative on August 16, 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.*