Your world, your files — private, offline, and completely yours.
Most worldbuilding tools store your creative work on someone else's server. Codex Cryptica takes the opposite approach: everything lives in your browser's local file system, exportable as standard Markdown files you can open in any editor. Your intellectual property stays with you.
Open the app and start building. Your vault is created locally in seconds with no sign-up form.
Every note is a plain Markdown file. Open them in VS Code, Obsidian, or any text editor — no export needed.
Your world exists as files on your machine. Delete the app and your data is still there, untouched.
No account. No server database leaks. Just quick, private, local-first worldbuilding.
Launch Codex Cryptica