# Boolean Builder by ChatStick vs Probability Theory Foundations

The clearest difference is in-app purchases: Probability Theory Foundations at none against Boolean Builder by ChatStick's 1. Probability Theory Foundations also leads on ads (none vs shown) and iOS requirement (15.1 vs 26.2). On price and device support there is nothing between them.

Both are free to download. Boolean Builder by ChatStick sells 1 one-off in-app purchase. Probability Theory Foundations asks for nothing beyond the download.

## The numbers

| Metric | Boolean Builder by ChatStick | Probability Theory Foundations |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Size | 11 MB | 38 MB |
| Requires iOS | 26.2 | **15.1** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [ChatStick Company Limited](https://appshunter.io/developer/1165816085) | [AFTW LLC](https://appshunter.io/developer/1886356149) |

## What reviewers say

### Boolean Builder by ChatStick

[App page](https://appshunter.io/ios/app/boolean-builder-by-chatstick/id6764350982)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Boolean Builder Premium | $1.99 | one-time |


### Probability Theory Foundations

[App page](https://appshunter.io/ios/app/probability-theory-foundations/id6773734025)

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

**In-app purchases:** none


## Frequently asked questions

### Is Boolean Builder by ChatStick free?

Boolean Builder by ChatStick is free to download, with in-app purchases available.

### Is Probability Theory Foundations free?

Probability Theory Foundations is free to download, with no in-app purchases.

### Do Boolean Builder by ChatStick or Probability Theory Foundations have ads?

Boolean Builder by ChatStick shows ads; Probability Theory Foundations 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.*