# Shared Kanban Board

> Create a real-time collaborative kanban board that syncs between browsers. Share a link — no account, no server, no setup.

## What does this tool do?

The Shared Kanban Board creates a collaborative task board with columns and cards that multiple people can edit simultaneously. Changes appear in real-time on all connected browsers. Data syncs directly between browsers using WebRTC — no server stores your data.

## How does it work?

1. Visit https://toolscanvas.com/tools/shared-kanban
2. A unique room is created automatically with a URL hash like `#abc-123`
3. Share the URL with others — anyone who opens it joins the same room
4. Add columns, add cards, move cards between columns — changes sync instantly

## How does syncing work?

The tool uses Yjs, a CRDT (Conflict-free Replicated Data Type) library. Each browser maintains its own copy of the board. When two people edit simultaneously, changes merge automatically without conflicts. The sync happens over WebRTC peer-to-peer connections — your data goes directly from browser to browser.

## What can I do?

- Add new columns with custom titles
- Rename columns by double-clicking the title
- Delete columns (also removes all cards in that column)
- Add cards to any column
- Edit cards by double-clicking the card text
- Delete individual cards
- Move cards left or right between adjacent columns using ← → buttons
- Undo and redo your own changes
- See how many other people are in the room

## Default columns

When you first open a new room, three columns are created automatically: "To Do", "In Progress", and "Done". You can rename or delete them.

## Does data persist?

Each browser saves the board in its local IndexedDB. If you close the tab and reopen the same room URL, your data is restored from local storage. However, if ALL participants close their tabs and a new person joins later, they start with a fresh board — there is no central server holding the data.

## Privacy

- All data stays in your browser and syncs directly to peers via WebRTC
- The Yjs signaling server only exchanges connection metadata to establish the peer-to-peer link — it never sees your board content
- No accounts, no tracking, no server-side storage

## Limitations

- Requires at least one peer to be online for new joiners to receive existing data
- WebRTC may not work behind some corporate firewalls
- Room URLs are not password-protected (anyone with the link can join)
- Data does not persist if all peers close their tabs before a new peer joins