Best Event Diagramming Software in 2026
Updated
In short: EventDiagram is ranked #1 of 24 as of 4 October 2026, ahead of OnePlan and SeatPlan.io. The best-ranked option with a free plan is OnePlan. The lowest first paid tier on this page is EventDiagram at $0.75/mo.
For planning an event’s room layout and guest seating, compare tools by 3D view, floor-plan import, seating plans and guest capacity. Guest-list import and team collaboration help distinguish the listed workflows, while free-plan availability and “Paid from” offer pricing details to weigh. The ranked entries start with EventDiagram and SeatPlan.io, followed by EventReception and 3D Event Designer; A Seat Awaits is also among the first options. Use the listed criteria to assess which capabilities matter for your event and how you need to coordinate layout decisions with others.
24 event diagramming software ranked on what their makers publish — plans and prices, free tiers, platforms and the facts on their own pages.
Event Diagramming Software, one module each. A lit port is something its maker publishes; 1 of the 24 on this page have a public API.
- 01 EventDiagram API yesOSS not on recordFREE yesDOCS 7.4$0.75/mo
- 02 OnePlan API not on recordOSS not on recordFREE yesDOCS 5.9$6.25/mo
- 03 SeatPlan.io API not on recordOSS not on recordFREE yesDOCS 5.9£2.42/mo
- 04 SeatPlanning API not on recordOSS not on recordFREE yesDOCS 5.9$39/mo
- 05 Cvent API not on recordOSS not on recordFREE not on recordDOCS 5.6
- 06 EventReception API not on recordOSS not on recordFREE not on recordDOCS 5.6€ 47/mo
- 07 A Seat Awaits API not on recordOSS not on recordFREE not on recordDOCS 5.5$49/mo
- 08 Interactiva API not on recordOSS not on recordFREE not on recordDOCS 5.4£25/mo
- 09 Metis Room Planner API not on recordOSS not on recordFREE not on recordDOCS 5.4£55/mo
- 10 3D Event Designer API not on recordOSS not on recordFREE not on recordDOCS 5.3$14.95/mo
- 11 Planning Pod API not on recordOSS not on recordFREE not on recordDOCS 5.2$199,319/mo
- 12 Delphi Diagramming API not on recordOSS not on recordFREE not on recordDOCS 5.1
- 13 EventDraw API not on recordOSS not on recordFREE not on recordDOCS 5.1
- 14 Eventscript API not on recordOSS not on recordFREE not on recordDOCS 5.1
- 15 SeatChart.io API not on recordOSS not on recordFREE not on recordDOCS 5.1
- 16 Table-Plan.com API not on recordOSS not on recordFREE not on recordDOCS 5.1
- 17 TablePlan.io API not on recordOSS not on recordFREE not on recordDOCS 5.1
- 18 Visrez Floor Plan Builder API not on recordOSS not on recordFREE not on recordDOCS 5.1
- 19 Event Floor Planner API not on recordOSS not on recordFREE not on recordDOCS 5.0
- 20 GoodEvent Layout API not on recordOSS not on recordFREE not on recordDOCS 5.0
- 21 E3D Planner API not on recordOSS not on recordFREE not on recordDOCS 4.9
- 22 EventFloorPlans API not on recordOSS not on recordFREE not on recordDOCS 4.9
- 23 Planur API not on recordOSS not on recordFREE not on recordDOCS 4.8
- 24 PerfectTablePlan API not on recordOSS not on recordFREE not on recordDOCS 4.6
Is your platform on this list?
Numbered spots on this list can be sponsored. They are labelled, and the editorial order and scores never change for payment.
Questions about this list
Which event diagramming software is ranked first on Inferse?
EventDiagram is ranked #1 of 24 with a score of 7.4. OnePlan is second and SeatPlan.io third.
How many of these have a free plan?
4 of the 24 on this page publish a free plan on their own pricing pages.
Which is the cheapest paid option?
On this page, EventDiagram has the lowest first paid tier we found: $0.75/mo.
How is this list ranked?
Ranked on what each maker publishes, open and connectable first: a public API, open-source code, the depth of its documentation and a free tier to try it on. Model lists are sorted by the figure in their title, exactly as each provider publishes it. Paid placements never change a rank.