Does Codex work without wifi at the game table?

Yes. Once the app has loaded once, everything works offline. Your notes, graph, and timelines are all stored locally.

Will I lose my data if I clear my browser?

Only if you clear browser storage explicitly. We recommend syncing to a local folder or Google Drive as a backup before clearing.

Does it work on mobile?

Yes. Codex is responsive and works on tablet and mobile browsers, though a larger screen is recommended for map and graph views.

Offline-First Campaign Tool

Offline RPG Campaign Manager

Prep your sessions anywhere: no internet, no server, no problem.

Codex Cryptica is built on the browser's Origin Private File System, which means it runs entirely on your device. Open your campaign at the table, on a train, or at a remote cabin. Your notes load instantly and every edit saves locally without a network call.

Open Offline App

Core Capabilities

100% Offline Operation

The full wiki, graph, and timeline work without any internet connection after the first page load.

Instant Local Loading

Notes load from your device's file system in milliseconds, no server round-trip or CDN dependency.

Optional Cloud Sync

When you want a backup, sync your vault to Google Drive or a local folder, on your terms.

RPG campaign manager Local-first RPG Free RPG campaign manager

Frequently Asked Questions

Ready to Build Your World?

No account. No server database leaks. Just quick, private, local-first worldbuilding.

Launch Codex Cryptica