Free whiteboard, diagram and kanban tools

Diagrams from text

• Mermaid editor — write Mermaid text and render flowchart, sequence, class, ER, gantt and mindmap diagrams live.
• Flowchart maker — type text and get a live flowchart (Mermaid), or draw one by hand.
• Mind map maker — type an outline and get a live mind map (Mermaid mindmap).
• AI flowchart tool — type Mermaid text or let an MCP agent draw the flowchart on the live board.

Whiteboards

• Collaborative whiteboard — share a URL and everyone draws on one canvas in real time.
• AI whiteboard — Claude and other MCP agents add text, sticky notes and Mermaid diagrams live, alongside you.
• Architecture diagram tool — sketch system boxes, arrows and Mermaid diagrams.
• System design whiteboard — sketch components, sequences and trade-offs for interviews and design reviews.
• Visual pastebin — paste screenshots, GIFs, diagrams and Mermaid onto one board and share it by link.

Kanban boards

• Online kanban board — To do / In progress / Done columns, with updates everyone sees live.
• Kanban board, no signup — create a kanban board without registration, import from Trello, export CSV.

Related pages

• Alternatives compared — cnvs.app compared with Miro, FigJam, MURAL, Excalidraw, tldraw, Microsoft Whiteboard and Trello.
• AI whiteboard via MCP — how an MCP-capable agent edits the same live board as you.

Before you start

One limit applies to every cnvs.app board: a board that nobody opens for 30 days is deleted, so save a .json backup of anything you need to keep.