OpeningBook
Browse, search & drill lines
Only for iPhone
Free · In‑App Purchases · Designed for iPhone. Not verified for macOS.
iPhone
Explore thousands of named chess openings, study them on a real board, and drill your repertoire with spaced repetition — all offline.
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.
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The developer, Zhenghong Peng, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Zhenghong Peng
- Size
- 4.2 MB
- Category
- Education
- Compatibility
Requires iOS 17.0 or later.
- iPhone
Requires iOS 17.0 or later. - Mac
Requires macOS 14.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
- English
- Age Rating
4+
- 4+
- In-App Purchases
Yes
- Training Mode $3.99
- Copyright
- © 2026 Zhenghong Peng