Overview

OnePlan brings maps, imported venue drawings and custom imagery into a shared event plan. Calculations for areas, barriers, spaces and capacities help teams assess the physical implications of a layout, while object coordinates and shared what3words addresses make locations easier to communicate. This is site-planning software, not a broad event-management suite: its value is in helping multiple parties work from a common venue plan.

Seating plans, floor-plan imports and a 3D view broaden the planning toolkit. OnePlan is a particularly plausible fit when teams already have CAD files or imagery to plan over, or need to coordinate a complex outdoor site.

Key features

Plans, measurements and location sharing

Map choices include Google Satellite, and users can import CAD files or custom imagery as overlays. That flexibility is useful for adapting plans to a real venue rather than drawing in isolation. Calculations for areas, barriers, spaces and capacities add practical planning context; what3words sharing and object coordinates support precise location handoffs.

Collaboration and exports

Real-time collaboration is central to OnePlan’s appeal. Team supports 3–10 people, role-based edit access and password-protected view-only links, a sensible combination when some partners should review plans without changing them. Free exports are low-resolution PNGs with a watermark; Pro upgrades those to high-resolution PNGs and adds CSV inventory export. The free export is adequate for informal review, but a watermark and low resolution are a poor fit for polished distribution.

Security and support

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 includes Knowledge Hub support, Pro helpdesk support, and Team onboarding, training and support materials. Those Team services suit organizations that need help getting multiple partners working in a shared process.

Pricing

OnePlan has a free plan, a 5-day trial and paid plans. The stated entry price is $75/user/mo (annual), while the named paid plans show monthly prices. Check which plan and billing terms apply to your intended purchase before committing.

Plan	Price	Includes	Best suited to
Free	Free	1 event, 25 objects and low-resolution watermarked PNG export	A student or organizer assessing the workflow on a small plan.
Team	90.00 USD per month	3–10 people, unlimited event plans and objects subject to fair-use caps, 6 levels per plan and 6 PNG overlays	Groups that need shared access, deeper plans and onboarding support.
Pro	99.00 USD per month	10 events, unlimited objects subject to fair-use caps, 3 levels per plan, 3 PNG overlays, high-resolution PNG and CSV inventory exports	Individual or smaller teams that prioritize export quality and inventory output over Team’s higher plan and overlay counts.

The Team and Pro plans make different trade-offs: Team permits 3–10 people and more levels and overlays, while Pro includes 10 events and the higher-quality exports. Both paid plans describe objects as unlimited, but fair-use caps limit objects to 10,000 per event and events to 500 per user account. Free’s one-event and 25-object ceiling is restrictive for real operations, and its watermarked export limits how professionally a plan can be shared.

Platforms

OnePlan runs on the web. That makes it a fit for browser-based planning workflows, but it is not presented as a native mobile or desktop application.

Who it's for

OnePlan names festivals, local government, road events, venues, sports federations and students among its audiences. It is best for organizers whose work depends on spatial layout, capacity planning and coordination across partner organizations. Teams that mainly need guest management or event registration should look for a broader event platform instead.

Pros and cons

Useful venue-specific planning: CAD and imagery overlays, map choices and site calculations support planning against real locations.
Partner-friendly access: Team combines role-based editing with password-protected view-only links for reviewers.
Clear free-tier ceiling: One event and 25 objects are enough to explore the product, not to plan a large event.
Plan trade-offs require care: Team offers more levels and overlays; Pro adds higher-resolution PNG and CSV inventory exports. Neither combines both sets of listed advantages.
Fair-use limits remain: “Unlimited” paid-plan objects are capped at 10,000 per event, and accounts are capped at 500 events.

Alternatives

For more options, browse Event Diagramming Software.

EventReception is a freemium option for Android, iOS and web users; its listed MAX-150 plan is 19.00 € per once for one event, up to 150 guests and two tablet devices.
SeatPlan.io suits readers looking at a web-based freemium alternative with a free plan and a one-time Pro option.
Table-Plan.com is worth considering for a small guest-focused project: its free plan allows up to 30 guests, one project and unlimited tables, and it runs on macOS, web and Windows.
3D Event Designer is a paid alternative across Android, iOS, macOS, web and Windows; its Basic plan is 14.95 USD per month for one user license, one floor plan and 2D/3D diagramming.
Cvent is a paid web, iOS and Android alternative for readers considering a broader event platform; its registration product can be tried for free.
EventDiagram is a freemium web and API alternative.
SeatChart.io is a web-based freemium alternative whose free plan includes one event, AI floor-plan imports, export and sharing.
Visrez Floor Plan Builder is a freemium web and API alternative.

Verdict

Choose OnePlan if your event depends on mapped site layouts, physical-capacity calculations and collaboration with external partners. Its strongest case is the combination of venue-specific overlays and shared, role-aware planning. Look elsewhere if you need generous free use, a native app, or a general-purpose event platform; the free caps are low, and paid plans divide collaboration depth and export advantages rather than combining them.

	OnePlan	SeatPlanning
Free plan	Yes	Yes
Free trial	Yes	No
Paid from	$75/mo	$39/mo
Platforms	Web	Web
Free plan	Yes	Yes
Paid from	75 /user/mo
Seating plans	Yes	Yes
Floor-plan import	Yes	Yes
3D view	Yes	No
Team collaboration	real-time	real-time
Guest-list import		Yes
Guest capacity		500 guests

OnePlan vs SeatPlanning

OnePlan

SeatPlanning