# Predicate Logic Foundations vs Watson

The clearest difference is in-app purchases: Predicate Logic Foundations at none against Watson's 1. Watson's advantage is iOS requirement (13.0 vs 15.1). On price, ads and device support there is nothing between them.

Both are free to download. Watson sells 1 one-off in-app purchase. Predicate Logic Foundations asks for nothing beyond the download.

## The numbers

| Metric | Predicate Logic Foundations | Watson |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | — | Fortnightly |
| Size | 38 MB | 24 MB |
| Requires iOS | 15.1 | **13.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [AFTW LLC](https://appshunter.io/developer/1886356149) | [fly sky pty ltd](https://appshunter.io/developer/1838696534) |

## What reviewers say

### Predicate Logic Foundations

[App page](https://appshunter.io/ios/app/predicate-logic-foundations/id6773451459)

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

**In-app purchases:** none


### Watson

[App page](https://appshunter.io/ios/app/watson-glaser-test-prep/id6774839071)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Unlock Full Access | $4.99 | one-time |


## Frequently asked questions

### Is Predicate Logic Foundations free?

Predicate Logic Foundations is free to download, with no in-app purchases.

### Is Watson free?

Watson is free to download, with in-app purchases available.

### Do Predicate Logic Foundations or Watson have ads?

Neither Predicate Logic Foundations nor Watson shows ads.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*