# OpeningBook — Browse, search & drill lines

> Browse, search & drill lines (iPhone/iPad app by Zhenghong Peng.)

- Source: https://appshunter.io/ios/app/openingbook/id6805625863 (this page in markdown: same URL + `.md`)
- Developer: [Zhenghong Peng](https://appshunter.io/developer/6797348186)
- Category: Education, Games
- Price: Free with in-app purchases
- Age rating: 4+
- Requires: iOS 17.0 · 4 MB
- Languages: American English
- Released: 2026-09-05
- Data updated: 2026-10-01
- User reviews in markdown: https://appshunter.io/ios/app/openingbook/id6805625863/reviews.md

## What is OpeningBook?

OpeningBook is a clean, offline reference and trainer for chess openings.

BROWSE EVERYTHING
• Thousands of named openings and variations, organized by ECO volume (A–E), family, and line — sourced from the open Lichess openings database.
• Step through any line move-by-move on a real, playable board.
• Read key ideas and classic traps for the major openings.

SEARCH & FILTER
• Find any opening by name, ECO code, or move sequence.
• Filter by line length with a simple move-count slider.

TRAIN YOUR REPERTOIRE
• Add lines to your training set as White or Black.
• Drill them in a play-your-side-vs-app loop.
• Spaced repetition brings each line back for review at the right time.

100% offline. No account, no ads, no tracking.

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

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



## Version history (last 1 release)

### 1.0 — 2026-09-05

No release notes.

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| App | Rating | Price | Category |
| --- | --- | --- | --- |
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| [Openit - Chess Opening Trainer](https://appshunter.io/ios/app/openit-chess-opening-trainer/id6749825647) | 3.0 (1) | Free | Education |
| [Chess Combinations](https://appshunter.io/ios/app/chess-combinations/id6504554035) | — | Free | Education |
| [Chess Openings — Chessmate](https://appshunter.io/ios/app/chess-openings-chessmate/id6780793638) | 4.7 (3) | Free | Education |
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## More apps by Zhenghong Peng

- [com.birdhopper.skyhopper](https://appshunter.io/ios/app/combirdhopperskyhopper/id6797348184)
- [Bridge Bid Coach](https://appshunter.io/ios/app/bridge-bid-coach/id6805654679)

All apps by Zhenghong Peng: https://appshunter.io/developer/6797348186

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-10-01.*