The list uses a peer-to-peer WebRTC connection via the room ID in the URL. Changes made by any participant are broadcast directly to other connected browsers using conflict-free replicated data types (CRDTs), so edits from multiple users merge automatically.

Yes. There are no accounts, logins, or sign-ups required. Just share the URL with the room ID in the hash fragment. Anyone who has the link can view and edit the list immediately.

The list is persisted locally in IndexedDB in each browser. When you reopen the same URL, your local data is restored. If all users are offline simultaneously, each person retains their last-synced copy.