# Paradox Factor vs Chessbook PGN Library

The clearest difference is price: Chessbook PGN Library at Free against Paradox Factor's $2.99. Chessbook PGN Library also leads on ads (none vs shown). Paradox Factor's advantage is in-app purchases (none vs 2) and iOS requirement (12.0 vs 18.0). On device support there is nothing between them.

Chessbook PGN Library is free to download; Paradox Factor costs $2.99 up front. Chessbook PGN Library sells 2 in-app purchases, starting at $9.99 per month. Paradox Factor asks for nothing beyond the download.

## The numbers

| Metric | Paradox Factor | Chessbook PGN Library |
| --- | --- | --- |
| Price | $2.99 | **Free** |
| Rating | **[3.9 (52 ratings)](https://appshunter.io/ios/app/paradox-factor/id674807797/reviews)** | — |
| Number of ratings | **52** | — |
| Positive reviews | 68.3% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | Yes | **No** |
| Update frequency | Every 6 months | — |
| Monetization | Ad-supported | — |
| Size | 30 MB | 4 MB |
| Requires iOS | **12.0** | 18.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 9+ | 4+ |
| Developer | [Hosted Games LLC](https://appshunter.io/developer/482415564) | [Mitaanshu Agarwal](https://appshunter.io/developer/1896724075) |

## What reviewers say

### Paradox Factor

[App page](https://appshunter.io/ios/app/paradox-factor/id674807797)

Explore the consequences of altering your past and future in this edgy time travel game. Make choices and navigate the ripple effects of your decisions as you play as a customizable character.

**Highlights:** Time travel gameplay, Alter past and future, Consequence-driven narrative, Character customization, Thought-provoking choices

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

**In-app purchases:** none


### Chessbook PGN Library

[App page](https://appshunter.io/ios/app/chessbook-pgn-library/id6772632379)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Chessbook Pro Monthly | $9.99 | per month |
| Chessbook Pro Yearly | $59.99 | per year |


## Frequently asked questions

### Is Paradox Factor free?

Paradox Factor costs $2.99, with no in-app purchases.

### Is Chessbook PGN Library free?

Chessbook PGN Library is free to download, with in-app purchases available.

### Do Paradox Factor or Chessbook PGN Library have ads?

Paradox Factor shows ads; Chessbook PGN Library 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.*