True data ownership for game masters and authors.
Codex Cryptica is designed around local-first architecture. Instead of renting access to your own campaign notes from server-hosted apps, Codex saves files directly to your device via standard browser APIs, guaranteeing privacy, lifetime access, and maximum performance.
Your files never touch third-party servers. Your world remains confidential, protected from server shutdowns and data leaks.
Utilizes browser-native Origin Private File System for database-like speed and robust local indexing.
Vaults are plain Markdown files with YAML metadata. Move your notes in and out of Codex Cryptica whenever you want.
No account. No server database leaks. Just quick, private, local-first worldbuilding.
Launch Codex Cryptica