# CrystalGen vs Lambda calculus

The clearest difference is price: Lambda calculus at Free against CrystalGen's $2.99. On ads, in-app purchases, device support and iOS requirement there is nothing between them.

Lambda calculus is free to download; CrystalGen costs $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.

## The numbers

| Metric | CrystalGen | Lambda calculus |
| --- | --- | --- |
| Price | $2.99 | **Free** |
| Rating | — | **[2.5 (2 ratings)](https://appshunter.io/ios/app/lambda-calculus/id6737766234/reviews)** |
| Number of ratings | — | **2** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 38 months | — |
| Monetization | — | Free |
| Size | 3 MB | 5 MB |
| Requires iOS | 17.2 | **16.0** |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Steve Kliewer](https://appshunter.io/developer/1255655631) | [Sungjun Kim](https://appshunter.io/developer/1602461985) |

## What reviewers say

### CrystalGen

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

**Features:** macOS Compatibility

**In-app purchases:** none


### Lambda calculus

[App page](https://appshunter.io/ios/app/lambda-calculus/id6737766234)

Learn the fundamentals of lambda calculus with this educational application. Gain a basic understanding of this important mathematical concept through an introductory experience.

**Highlights:** Introduction to lambda calculus, Basic understanding of concepts, Educational content

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is CrystalGen free?

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

### Is Lambda calculus free?

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

### Do CrystalGen or Lambda calculus have ads?

Neither CrystalGen nor Lambda calculus shows 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.*