PlanSeats is the modern seating chart software that makes event planning simple. Drag-and-drop simplicity, real-time collaboration, and pricing that works for everyone, from intimate gatherings to 500+ guest events.
Free plan for your first event, no credit card.
Prismm, the platform wedding planners and venues knew for years as AllSeated, is being wound down. Cvent acquired Prismm in April 2025 and announced that the standalone platform shuts down on December 31, 2026. The phase-out has already started: accounts are losing the ability to create new events between July and September 2026, and from October 1 the platform is view-and-export only.
Cvent's intended destination is Cvent Event Diagramming, an enterprise product priced and packaged for hotels and large venues. Prismm templates, favorites, and object groups do not migrate automatically, so most teams are rebuilding their setup somewhere regardless. That makes this a natural moment to choose a tool that matches how you actually work.
PlanSeats is a focused seating chart and floor plan tool for events: weddings, galas, corporate dinners, mitzvahs, and every other seated event. You import your guest list from a CSV, lay out tables on a real floor plan, seat guests by hand or with auto-assign, and share a live link with clients, venues, and caterers. Pricing is public and self-serve: a free plan for a small event and a Planner plan at $8.99 a month for unlimited guests and tables on one event.
What PlanSeats does not do is 3D venue visualization or virtual tours. If those are core to your venue sales process, Cvent Event Diagramming is the closer fit. If what you used Prismm for was seating charts, floor plans, and guest collaboration, PlanSeats covers that workflow without enterprise contracts or onboarding calls.
AllSeated rebranded as Prismm
Cvent acquired Prismm
New event creation switched off account by account
Prismm becomes view-and-export only
Standalone Prismm platform shuts down
Cvent is retiring the standalone Prismm platform and steering customers toward Cvent Event Diagramming (formerly Social Tables). Templates, favorites, and object groups do not migrate automatically, so planners and venues are choosing where their seating workflow lives next.
See why PlanSeats is the top Prismm alternative for seating charts.
Unlike Prismm, PlanSeats offers clear pricing with no hidden fees.
See why event planners choose PlanSeats over Prismm.
Export your guest lists from Prismm while export still works, import them into PlanSeats as CSVs, and rebuild your floor plans on a tool that is not going anywhere.
If Prismm was your seating and floor plan tool, PlanSeats covers that job without the enterprise venue sales suite attached.
Public pricing, month-to-month billing, and a free plan to evaluate with. No quotes, no procurement.
Send clients a view link or invite them as editors. Everyone sees the same live chart, just like Prismm's collaboration but simpler.
Add your tables, import your guests, and share the chart with your partner, planner or venue.
Free plan for your first event, no credit card.