OnePlan

OnePlan is web-based software for building event-site and venue plans with suppliers, public agencies and other partners. It is best suited to organizers coordinating complex sites against maps or venue drawings. Its combination of site calculations and shared planning is compelling, though the free tier is too restricted for sustained work.

Overview

OnePlan centers on a shared visual plan rather than general event administration. Teams can choose map options, import venue CAD files or custom imagery as overlays, then place and arrange event elements on that material. Calculations for areas, barriers, spaces and capacities help translate a layout into practical site-planning information.

Location sharing adds a useful communication layer: teams can share what3words addresses and view coordinates for objects on the plan. Seating plans, floor-plan import and 3D view are also supported. Together, these tools make OnePlan more relevant to physical site coordination than to organizers mainly seeking registration or guest-management software.

Key features

Layouts, measurements and access

Map choices and imported overlays let planners work from venue-specific material, while calculations provide context for capacity and spatial decisions. Real-time collaboration helps keep partners aligned around a common plan. On Team, role-based edit access and password-protected view-only links give organizers a way to distinguish contributors from people who only need to see the plan.

OnePlan says it is hosted on AWS, encrypts data at rest and in transit, offers two-factor authentication and single sign-on, and conducts regular security audits. Support scales by plan: Free has instant Knowledge Hub support, Pro has helpdesk support, and Team includes onboarding, training and support materials.

Pricing

The Free plan costs nothing and allows one event and 25 objects, with low-resolution watermarked PNG export. That is enough to explore a layout, but the small event and object allowance and marked export make it a poor fit for delivering polished plans or managing multiple sites.

Team costs $75 a year, billed $900 USD billed annually. It covers 3–10 people, unlimited event plans and objects subject to fair-use caps, six levels per event plan and six PNG overlays. Role-based editing, view-only links, onboarding and training make it the more suitable choice for partner-heavy planning, provided the team fits the seat range.

Pro costs $82 a year, billed $984 USD billed annually. It supports 10 events, unlimited objects subject to fair-use caps, three levels per plan and three PNG overlays. It also includes high-resolution PNG event-plan and CSV inventory exports plus helpdesk support. Pro favors users who need those exports and more event capacity; Team offers more levels and overlays, as well as collaboration for 3–10 people.

Paid plans start at $75/user/mo (annual), and a 5-day trial is available. Fair-use caps limit objects to 10,000 per event and events to 500 per user account, so “unlimited” plan allowances still have defined ceilings.

Platforms

OnePlan runs on the web. Google Satellite map choices and what3words location sharing complement CAD and custom-imagery overlays.

Who it's for

Festivals, local government, road events, venues and sports federations are among the audiences OnePlan names. It is a particularly strong match when those groups need a shared, mapped site plan with capacity and area calculations. Students are also an intended audience, though the Free plan’s one-event, 25-object limit constrains larger projects.

Pros and cons

• Pros: CAD and custom-imagery overlays support planning against venue-specific material rather than a generic canvas.
• Pros: Calculations for areas, barriers, spaces and capacities add practical site-planning context.
• Pros: Team combines 3–10 seats, role-based editing and protected view-only links for cross-organization collaboration.
• Cons: Free is capped at one event and 25 objects, and its PNG export is low-resolution and watermarked.
• Cons: The plan limits differ: Team has six levels and overlays, while Pro has three of each, so buyers must trade planning depth against event count and exports.
• Cons: The 5-day trial is brief for teams evaluating a multi-partner workflow.

Alternatives

For more event-diagramming options, browse Event Diagramming Software. EventDiagram is another freemium web option, with API support and a maker who identifies as a live-event producer.

Choose SeatPlan.io if a seating-focused tool’s free design and guest-list import matter more than saved work or PDF export: its free offer has no saved work and no PDF export. SeatPlanning is a fit for smaller projects that can work within its free allowance of one project, 40 seats, five tables and 80 elements.

EventReception may suit organizers who want Android or iOS alongside web access and an event-priced option capped at 150 guests and two tablet devices. Cvent is worth considering when a paid event platform with web and mobile apps is preferable; its registration product can be tried for free.

3D Event Designer is an alternative for buyers specifically seeking 2D/3D event diagramming across desktop and mobile platforms, with a Basic plan for one user and one floor plan. A Seat Awaits offers a one-time Starter Pass for a single event of up to 50 guests, including export and print. Interactiva is another web-based paid option, with monthly plans beginning at £25 a month for one user and one event.

Verdict

Choose OnePlan if your event depends on a detailed shared site layout, venue overlays and calculations, especially when outside partners need to collaborate. Its strongest case is the link between mapped planning and practical site measurements; its main drawback is the sharp divide between a highly capped free tier and paid plans with different capacity trade-offs. Organizers focused chiefly on guest lists, registration or a small seating chart should look elsewhere.