An online whiteboard for your whole team
Think in diagrams. Together.
Sketch, plan, and diagram together on one fast, minimal online whiteboard — shapes, sticky notes, flowcharts, and real UML when you need the rigor. No install.
One online whiteboard for sketching, planning, and real diagrams
Freeform online whiteboard
22 basic shapes, callouts, and kanban ticket columns for the sketches, retros, and planning around the UML.
Shapes · Labels · Callouts · Columns · Stickies
Flowcharts & activity diagrams
Flowcharts from initial node to flow final, with decisions, forks, signals, and swimlanes to keep owners clear.
Action · Decision · Fork/Join · Signals · Swimlanes
UML class diagrams
Classes with real attribute and method compartments — rows are draggable shapes, and the class resizes itself.
Class · Interface · Package · Note
UML sequence diagrams
Lifelines, activations, and fragments with every message type — drawn as fast as you can think.
Actor · Participant · Sync · Async · Reply · Create · Destroy
Umlout is an online whiteboard first: open a board, grab a marker, and draw — like a dry erase board online, shared with everyone. Teams use it as a collaborative whiteboard for workshops and retros, and as a flowchart maker or process chart maker when work needs mapping. And unlike most whiteboard tools, it speaks real UML when you need the rigor — proper class, sequence, and activity notation on the same canvas.
Real time, for real
Live cursors, presence, and instant sync across everyone connected — with automatic recovery if you drop offline.
Feedback on the shape itself
Threaded comments live on shapes and connections — no more “see slide 3” in a chat thread. Reply, resolve, done.
Share with exact permissions
Editor, Commenter, Viewer — assigned per person or via a read-only public link. Revoke or change roles anytime.
Precision without effort
Snap-to-grid, alignment guides, rulers, and orthogonal connectors — with undo and redo on every single operation.
Styled, then shipped
Themes, a style panel, and a format painter keep boards consistent — then export clean SVG in one click.
A model behind the diagrams
Keep classes, interfaces, and actors in a folder-based model repository — organized once, shared with the same roles and live sync.
Your AI assistant can draw here too
Umlout ships an MCP server, so tools like GitHub Copilot can add shapes, connections, and comments in natural language. Changes appear on the canvas live — for everyone.
Up and running in a minute
No install, no credit card.
Create an account
Sign up in seconds and land straight on a blank canvas.
Draw your diagram
Pick a notation — or none — and drag, drop, and connect shapes.
Invite your team
Share a link or invite by email and edit together in real time.
Simple, transparent pricing
Start free. Upgrade when you need more.