# Pendulum Lab vs Lambda calculus

The clearest difference is price: Lambda calculus at Free against Pendulum Lab's $0.99. Lambda calculus also leads on in-app purchases (none vs 1). On ads, device support and iOS requirement there is nothing between them.

Lambda calculus is free to download; Pendulum Lab costs $0.99 up front. Pendulum Lab sells 1 one-off in-app purchase. Lambda calculus asks for nothing beyond the download.

## The numbers

| Metric | Pendulum Lab | Lambda calculus |
| --- | --- | --- |
| Price | $0.99 | **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 | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 5 weeks | — |
| Monetization | — | Free |
| Size | 4 MB | 5 MB |
| Requires iOS | **15.0** | 16.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [hyeonsu jeong](https://appshunter.io/developer/1628268684) | [Sungjun Kim](https://appshunter.io/developer/1602461985) |

## What reviewers say

### Pendulum Lab

[App page](https://appshunter.io/ios/app/pendulum-lab/id6661026555)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Triple Pendulum Unlock | $0.99 | one-time |


### 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 Pendulum Lab free?

Pendulum Lab costs $0.99, and also offers in-app purchases.

### Is Lambda calculus free?

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

### Do Pendulum Lab or Lambda calculus have ads?

Neither Pendulum Lab 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.*