ChessCodex

ChessCodex

In-app purchases

About this app

ChessCodex is a chess study app focused on opening preparation and game exploration.
What you can do

Build and review your own opening repertoires
Study positions and move choices
Browse and search large collections of games (offline)
Filter games by common criteria (year, ECO, players, results, dataset)

Offline databases (optional downloads)
Some features (Games / Search / Filters) require downloading free offline chess databases from within the app.
You can choose which databases to download, and you can keep using repertoire and position study even without them.

Designed for study
Fast UI for navigating lines and variations
Notes per position (FEN)
Smooth download manager with progress and resume support

No ChessCodex account is required. Your personal notes, repertoires, and imported games stay on your device.

What’s new

Improved the first guided tour experience.

The app now estimates required storage more accurately when downloading multiple database packs.

Fresh installs now start with the dark theme and classic board colors.

Simplified the Download page to make database selection clearer.