EventDiagram vs SeatPlan.io

EventDiagram is a web application for making, sharing and coordinating event floor plans and diagrams. Plans use real-world dimensions, with capacity, spacing and square feet per seat recalculated as objects move. A 3D view comes from the same scene as the 2D plan and represents objects at their real heights. Its AI copilot can create or edit a to-scale layout from plain-language requests, with proposed changes left for review and approval. An MCP server and API keys let Claude or other AI tools read and write diagrams. Recipients of share links can view plans in 3D, leave pinned comments and approve a specific version without an account. Seating tools include guest-list imports, table assignments, meal and dietary tracking, and check-in. PDF, image and data exports are available on every plan, though Free exports have a watermark. The maker says private content and copilot prompts are not used to train AI models; Anthropic processes the diagram being edited for a copilot request. EventDiagram says it is not SOC 2 certified today. It offers a free plan; its pricing note lists paid plans from $9/mo. It runs on web and has an API.

SeatPlan.io is a web-based seating chart maker for weddings, classrooms, events, and other gatherings. Its designer supports drag-and-drop layouts with round or rectangular tables, and users can import guest lists from CSV. Event Manager expands the workflow with floor-plan imports from photos, screenshots, PDFs, and CAD DXF files; DXF blueprints are brought in at exact scale. It also provides client links with view-only, editing, or check-in permissions and real-time updates. Door staff can check guests in from a phone link without an account. QR seat finding and Apple and Google Wallet passes are available on eligible plans. Event Temple integration imports booking guests and refreshes the roster when an event is reopened, but seating assignments do not sync back. Free costs nothing, Pro costs £8 one-time, Collaborate £14 one-time, Classroom £29 per school year when billed annually, and Event Manager £35 per month when billed annually. Event Manager has no stated guest or table limit, but imported guest-list files are capped at 5MB.