EventDiagram vs OnePlan
EventDiagram
eventdiagram.comOnePlan
oneplan.ioSide by side
| Figure | EventDiagram | OnePlan |
|---|---|---|
| Price from | $0.75/mo | $75/mo |
| Free plan | Yes | Yes |
| Free trial | — | Yes |
| Open source | — | — |
| Web | Yes | Yes |
| API | Yes | — |
| Plans published | 10 | 5 |
| Spec score · Event Diagramming Software | 9.0 (#1) | 7.8 (#9) |
| Exports | PDF, image and data exports are available on every plan; Free exports contain a watermark. | Pro includes high-resolution PNG event plan and CSV inventory exports, while the Free plan provides low-resolution watermarked PNG export. |
| Headquarters | Phoenix, Arizona, USA | London, England, UK |
| Integrations | EventDiagram provides an MCP server and API keys so users’ Claude or other AI tools can read and write diagrams. | OnePlan features Google Satellite map choices and what3words location sharing; the official features page also describes importing CAD and custom imagery as overlays. |
| Intended users | The product is presented for hotels and venues, corporate and wedding planners, caterers, rental companies, and AV and production teams. | The site names festivals, local government, road events, venues, sports federations, and students among its event-planning audiences. |
| Product | EventDiagram is a web application for creating, sharing, and collaborating on event floor plans and diagrams. | OnePlan is a visual platform for planning event sites and venues collaboratively with suppliers, vendors, local authorities, security services, and other partners. |
| Security | The maker says passwords use salted bcrypt hashes, sessions use signed expiring tokens in HTTP-only cookies, and traffic uses HTTPS. | OnePlan says it is hosted on AWS, uses encryption at rest and in transit, offers two-factor authentication and single sign-on, and conducts regular security audits. |
| Support | The contact page says a person handles account, diagram and billing questions, typically within the same business day. | The Free plan includes instant Knowledge Hub support, the Pro plan includes helpdesk support, and the Team plan includes onboarding, training, and support materials. |
Plans
EventDiagram
- FreeFree
- Solo$9 a month
- Venue Group / Enterprise$9 a year
- Pro$18 a month
- Event Pass$24, paid once
- Drawn for your event$49, paid once
- Small Venue$49 a month
- Business$149 a month
- Venue$149 a month
- Large VenuePriced on request
In their own words
EventDiagram
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.
OnePlan
OnePlan is a web platform for planning event sites and venues with suppliers, vendors, local authorities, security services and other partners. Planners can choose map options, import venue CAD files or other overlays, and arrange plans on that material. The platform calculates areas, barriers, spaces and capacities, and lets users share what3words addresses and see coordinates for objects on a plan. Real-time collaboration is listed. The Team plan supports 3–10 people with role-based editing and password-protected view-only links. Free exports are low-resolution, watermarked PNGs; Pro includes high-resolution PNG plans and CSV inventory exports. The Free plan allows one event and 25 objects, while fair-use caps limit plans to 10,000 objects per event and 500 events per account. OnePlan names festivals, local government, road events, venues, sports federations and students among its audiences. It has a free plan, a five-day trial, and paid pricing from $75/user/mo (annual).