Planner accounts are typically those responsible for planning the details of the service and/or leading teams that serve. Planners access WP via the traditional www.worshipplanning.com web address.
Helpers are typically the volunteers. Those that show up for a service to serve, and don't contribute to the planning, scheduling, or organizing of the service details. Helpers typically access WP via the MyWP site (my.worshipplanning.com).
category: People