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