OnePlan

OnePlan is a web platform for mapping and coordinating event sites with suppliers and other partners. It suits organizers who need shared, measured plans for complex venues or outdoor events. Its strongest case is site planning; teams focused mainly on registration or guest management should look elsewhere.

Overview

Teams can plan on map options, imported venue CAD files, or custom imagery overlays. Calculations for areas, barriers, spaces, and capacities make the layouts more useful for practical site decisions than a simple visual diagram. what3words sharing and coordinates for placed objects help teams communicate locations precisely.

OnePlan also supports seating plans, floor-plan imports, 3D view, and real-time collaboration. Its focus is physical site coordination, not general event administration. The company was founded in 2019; its founder says the mission to transform event-site planning began in 2018.

Key features

Mapped plans and site calculations

Map choices and imported drawings give teams a way to build around venue-specific material. Calculations for capacity and space add planning context, particularly useful when multiple organizations need to coordinate barriers, areas, and event infrastructure. These tools make OnePlan a more natural fit for site operations than for tasks such as attendee registration.

Collaboration, sharing, and exports

Team supports 3–10 people, role-based edit access, and password-protected view-only links. That distinction can help keep a shared plan useful to both contributors and partners who only need to review it. Pro adds high-resolution PNG plan and CSV inventory exports; Free exports only low-resolution PNGs with a watermark, a meaningful limitation for polished sharing or reuse.

Security and support

OnePlan says it is hosted on AWS and uses encryption at rest and in transit, two-factor authentication, single sign-on, and regular security audits. Support scales with the plan: Free includes instant Knowledge Hub support, Pro helpdesk support, and Team onboarding, training, and support materials.

Pricing

Free costs nothing and allows one event, 25 objects, and low-resolution watermarked PNG export. It is useful for a small trial layout, but the one-event and 25-object caps make it a poor fit for an active or complex event.

Team costs $90 a month for 3–10 people, unlimited event plans and objects subject to fair-use caps, six levels per plan, and six PNG overlays. It is the better choice for a multi-partner operation that needs broader collaboration and deeper plan layering. Pro costs $99 a month for 10 events, unlimited objects subject to fair-use caps, three levels per plan, and three PNG overlays. It suits a user who needs more event capacity and stronger exports, but not Team's stated multi-person access features.

The pricing note gives paid pricing from $75/user/mo (annual), while the named Team and Pro plan prices are monthly. Fair-use caps limit plans to 10,000 objects per event and 500 events per user account. A five-day trial is offered. The caps matter even on plans described as having unlimited events or objects.

Platforms

OnePlan runs on the web. Google Satellite map choices and what3words location sharing are among its integrations; CAD files and custom imagery can be imported as overlays.

Who it's for

Its intended audiences include festivals, local government, road events, venues, sports federations, and students. It is most compelling when several parties need to plan against a shared map or venue drawing and communicate exact site locations. It is less suited to small events that need only basic seating diagrams, or teams whose priority is registration rather than site layout.

Pros and cons

• Pros: Map and CAD-based planning, site calculations, and location sharing bring layout and operational context together.
• Pros: Team's role-based access and view-only links support collaboration across contributors and reviewers.
• Pros: Pro includes high-resolution PNG and CSV exports, offering more useful handoff formats than Free.
• Cons: Free is limited to one event and 25 objects, and its PNG export is watermarked and low-resolution.
• Cons: Team and Pro trade off levels, overlays, and event capacity, so the right paid plan depends on whether collaboration or event volume matters more.
• Cons: Fair-use ceilings of 10,000 objects per event and 500 events per account constrain the meaning of “unlimited.”

Alternatives

For a wider comparison, see Event Diagramming Software.

• EventDiagram is another freemium option for web and API users.
• SeatPlan.io may suit a reader looking for a low-cost, one-time seating-planning purchase rather than a mapped event-site platform.
• SeatPlanning offers a free project with limits on seats, tables, and elements, which may better fit a small, bounded seating plan.
• Cvent is a web, iOS, and Android option for readers who want a broader event platform and can license only the solutions they need.
• EventReception offers per-event guest limits and tablet-device limits, which may suit a defined event reception workflow.
• A Seat Awaits offers a one-time pass for a single event with export and print, for readers focused on guest seating.
• 3D Event Designer is a paid option with 2D/3D event diagramming and a single-user Basic license.
• Delphi Diagramming is another web-based diagramming option.

Verdict

Choose OnePlan if event-site maps, measured layouts, precise location sharing, and partner coordination are central to the job. The combination of mapped planning and collaboration is its main advantage; the steep jump from a tightly capped free tier and the trade-offs between Team and Pro are reasons to compare plans carefully or look elsewhere for simpler seating and guest-management needs.