Map your fantasy worlds visually with local-first bidirectional linking.
Codex Cryptica is a free worldbuilding tool and private lore database designed to keep your creative assets safe and organized on your own device. Plan characters, locations, factions, and items with standard Markdown files that load instantly. See the connections between your notes using our built-in relationship maps and chronological timelines, all running 100% in your browser.
Visualize relationships and draw map pins dynamically across factions, NPCs, and events.
Map campaign history and character journals using chronological eras and custom calendars.
Your files never leave your device. Stored securely in your browser's private filesystem.
No account. No server database leaks. Just quick, private, local-first worldbuilding.
Launch Codex Cryptica