QuickPlanX is a project planning app for Mac, iPad, and iPhone. It lets users create work breakdown structures and schedule tasks with interactive Gantt charts. Plans can include task dependencies, milestones, resources, project calendars, and custom fields. Users can save baselines to compare planned and actual dates, and view progress, cost trends, and resource allocation through S Curve and bar charts. The app provides Table, Gantt, Tree, and Column views for working with schedules. Users can reorganize task hierarchies, update dates and resources, and adjust layouts and Gantt chart styles. Typical workflows include building a project plan on Mac, reviewing or editing it by touch or Apple Pencil on iPad, and checking task progress on iPhone. QuickPlanX syncs project data across devices through Apple CloudKit and the user’s Apple ID. Plans or selected sections can be exported as PDF, CSV, or image files. The app also supports importing and exporting Microsoft Project XML schedules, importing and exporting OPML outlines, importing CostX estimates, and publishing dates to ICS calendar files. These formats support sharing plans and transferring project information to other tools.