# Chess Openings vs OpeningBook

Chess Openings and OpeningBook 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. Chess Openings sells 2 in-app purchases, starting at $9.99 per month and OpeningBook sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

## The numbers

| Metric | Chess Openings | OpeningBook |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (2 ratings)](https://appshunter.io/ios/app/chess-openings-prologue/id6789625585/reviews)** | — |
| Number of ratings | **2** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 4 days | — |
| Monetization | Free with in-app purchases | — |
| Size | 20 MB | 4 MB |
| Requires iOS | 17.0 | 17.0 |
| Devices | **iPhone, iPad** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [AGENCE DEBORD EURL](https://appshunter.io/developer/1538454909) | [Zhenghong Peng](https://appshunter.io/developer/6797348186) |

## What reviewers say

### Chess Openings

[App page](https://appshunter.io/ios/app/chess-openings-prologue/id6789625585)

Learn chess openings by actively playing them through guided, hinted, and memory recall stages. Build a personalized repertoire of over 300 verified openings, with spaced repetition for long-term retention. Designed for adult club players seeking a calm, distraction-free learning experience.

**Highlights:** Learn by playing moves, Guided, hinted, and memory recall modes, 300+ verified openings, Spaced-repetition review, Build custom repertoire, Distraction-free design

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Prologue Monthly | $9.99 | per month |
| Prologue Yearly | $39.99 | per year |


### OpeningBook

[App page](https://appshunter.io/ios/app/openingbook/id6805625863)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Training Mode | $3.99 | one-time |


## Frequently asked questions

### Is Chess Openings free?

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

### Is OpeningBook free?

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

### Do Chess Openings or OpeningBook have ads?

Neither Chess Openings nor OpeningBook 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.*