AppMarketSpy › Education › OpeningBook
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App info
- Developer
- Zhenghong Peng
- Category
- Education, Games
- Released
- Sep 5, 2026
- Version
- 1.0 (Sep 5, 2026)
- Price
- Free
- Size
- 4.0 MB
- Requires
- iOS 17.0
- Age rating
- 4+
- Languages
- English
In-app purchases
| Training Mode | $3.99 |
Current prices, App Store US.
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About 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.
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