EventDiagram

Overview

EventDiagram is a web workspace for planning event layouts and coordinating feedback around them. It suits venues and event teams that need measured floor plans alongside guest seating and approvals. Its strongest case is keeping room fit, attendee needs, and stakeholder sign-off in one workflow; the free tier is constrained, and it is not SOC 2 certified.

Key features

Plans use real-world dimensions, and capacity, spacing, and square feet per seat update as objects move. That gives planners useful feedback while arranging a room, rather than leaving them to infer whether a layout fits. The 3D view uses the same scene as the 2D plan and represents objects at their real heights, so teams can review the arrangement from another perspective without maintaining a separate model.

The AI copilot can build or edit a to-scale layout from plain-language requests, with changes presented for review and approval. An MCP server and API keys also allow Claude and other AI tools to read and write diagrams, which may suit teams incorporating those tools into their workflow. Copilot use is quota-limited by plan. The maker says private content and prompts are not used to train AI models, but the diagram being worked on is processed by Anthropic to fulfill a copilot request.

Guest-list import, table assignments, meal and dietary tracking, and check-in connect planning to event operations. Share links let people view plans in 3D, pin comments, and approve a particular version without an account. PDF, image, and data exports are available across plans, although Free exports carry a watermark.

The maker says passwords are stored as salted bcrypt hashes, sessions use signed expiring tokens in HTTP-only cookies, and traffic uses HTTPS. Those are relevant safeguards, but they do not replace SOC 2 certification for buyers whose procurement requires it. The site also offers 16 help articles and a 25-minute course of 16 short lessons; security questions can be sent to the team.

Pricing

Free costs nothing, has no trial clock and requires no credit card. It includes one active diagram, three AI copilot messages a month, unlimited viewers and commenters, the core object library, share links, and watermarked exports. It is a sensible way to try the sharing workflow, but one active diagram and three messages make it a limited home for ongoing or AI-heavy work.

Solo costs $990 a month, monthly or annually, and includes one editor, unlimited events and diagrams, 25 AI copilot messages a month, and clean exports. It fits an individual who needs more than Free's single active diagram and wants unwatermarked output, but it remains a one-editor plan.

Pro costs $18,180 a month, monthly or annually. It raises the allowance to up to three editors and 75 copilot messages a month, and adds 3D view, the full production library, branding, version history, and attendee import. It is the more complete choice for a small production team; the editor and message caps still matter.

Business costs $1,491,490 a month, monthly or annually. It includes unlimited members, conversion of one property's floor plans, the company's own inventory, and 150 copilot messages a month. That scope suits a property operation needing shared access and its own inventory, rather than a small team seeking only more diagrams.

Venue costs $149 a month, billed per property, with monthly billing always available. It includes unlimited event spaces and team members, concierge floor-plan conversion, a verified venue profile, branded share links, and 300 copilot messages a month. It is tailored to venues managing multiple spaces and public-facing sharing.

Venue Group / Enterprise is custom pricing, scoped with the company. Its features include a multi-property hierarchy, SSO/SCIM, audit logs, API, managed migration, an SLA, and dedicated success. It is the tier aimed at organizations coordinating properties and requiring enterprise administration. The stated paid plan prices are unusual relative to the general note of paid plans from $9/mo, so buyers should confirm the applicable price and billing terms before committing.

Platforms

EventDiagram is available on web and through an API. It is not presented as a mobile app.

Who it's for

The product is aimed at hotels and venues, corporate and wedding planners, caterers, rental companies, and AV and production teams. It is most compelling when room dimensions, guest seating, and approval workflows need to stay connected. Teams that only need a small one-off seating chart may find the Free cap or paid plan scope more than they need; organizations requiring SOC 2 certification should choose another product.

Pros and cons

• Pros: Live spatial and capacity figures make the plan more useful for evaluating room fit than a static drawing.
• Pros: Seating, meal and dietary tracking, check-in, and attendee import connect layouts to event operations.
• Pros: Version-specific approvals and pinned comments work through share links, without requiring recipients to create accounts.
• Cons: Free allows only one active diagram and three copilot messages a month, and its exports are watermarked.
• Cons: The maker says EventDiagram is not SOC 2 certified, a material limitation for buyers with that compliance requirement.
• Cons: The displayed paid plan prices and the general starting-price note do not align clearly, so buyers should verify the amount and billing basis for their chosen tier.

Alternatives

Event Diagramming Software is a category page for comparing options across event diagramming tools.

Choose OnePlan if its free plan's one event, 25 objects, and low-resolution watermarked PNG export cover your needs, or if a free trial matters. Its Team plan is $75 a year, billed $900 USD billed annually.

SeatPlan.io may suit a buyer who wants a one-time Pro purchase rather than a monthly subscription; its free plan includes guest-list import and one AI floor-plan import to try, but does not save work or export PDFs.

SeatPlanning is worth considering for a small project that fits its Free limits of one project, 40 seats, five tables, and 80 elements, with a watermarked PDF export.

Choose Cvent if you need a broader event platform with web, iOS, and Android access; its registration product can be tried for free.

EventReception is another freemium option with a free trial and Android, iOS, and web platforms.

A Seat Awaits offers one-time per-event passes, including a Starter Pass for one event with up to 50 guests.

3D Event Designer is a paid option with a Basic plan at $14.95 a month for one user license and one floor plan, including 2D/3D diagramming and 2D-to-3D conversion.

Delphi Diagramming is another web-based paid option.

Verdict

EventDiagram is a strong fit for venues and event professionals who want dimension-aware plans, attendee workflows, and approvals tied to a shared diagram. Its connected planning and operations tools are the main reason to choose it. Look elsewhere if a SOC 2 certification is mandatory, or if the free tier's one active diagram and watermarked exports are not enough and the paid pricing does not fit.