# ChessFlex vs Chessbook PGN Library

ChessFlex and Chessbook PGN Library are too close to call on the numbers: across 5 compared parameters — price, ads, in-app purchases and device support among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.

Both are free to download. ChessFlex sells 1 one-off in-app purchase and Chessbook PGN Library sells 2 in-app purchases, starting at $9.99 per month. Whichever you choose, the download price is not the number that matters.

## The numbers

| Metric | ChessFlex | Chessbook PGN Library |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/chessflex/id6761064938/reviews)** | — |
| Number of ratings | **1** | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 9 days | — |
| Monetization | Free with in-app purchases | — |
| Size | 13 MB | 4 MB |
| Requires iOS | **17.6** | 18.0 |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Labham LLC](https://appshunter.io/developer/1881832925) | [Mitaanshu Agarwal](https://appshunter.io/developer/1896724075) |

## What reviewers say

### ChessFlex

[App page](https://appshunter.io/ios/app/chessflex/id6761064938)

Play chess with friends or AI without accounts or servers. Features a FIDE-formula rating system and asynchronous play. Offers an optional one-time unlock for in-depth game analysis and coaching.

**Highlights:** Play with friends via QR code or iMessage, Human-like AI bots with adjustable ELO, FIDE-formula rating system, Asynchronous and timed game modes, No chat, only chess notation, Private by design, no accounts or tracking, Optional game analysis and coaching unlock

**Features:** macOS Compatibility, Family Sharing

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| ChessFlex Study | $7.99 | one-time |


### 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 ChessFlex free?

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

### Is Chessbook PGN Library free?

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

### Do ChessFlex or Chessbook PGN Library have ads?

Neither ChessFlex nor Chessbook PGN Library 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.*