Pro Infinite hierarchy
Cards can have checklists. Items in the checklist are actual cards, which can be organized in their own board.
Projects is like a tree of card, with unlimited sub-level boards. Perfect to manage complex project with hierarchy. You can choose different settings and user permissions at every level.
Pro Custom card groups
Group your card in unlimited dimensions.
You can use the built-in groups (lists, labels, milestones), adapt them or create your own.
This allows you to manage a projects in other dimensions (by versions, teams, offices, categories, releases, etc).
Visualize your project in kanban and table view, by the group types of your choice.
Drag and drop cards quickly between groups.
Track progress by group types (ideal for managing iterations).
Pro Card models
Use or create card model to best represent your work, for each of your project.
Dozens of types of attributes available, including text, yes/no values, map, file attachments, due date, etc
Perfect to manage projects of different kinds, with multiple card types - like ideas, sales contact, customer feedback, bug report, feature request, bill/order.
Pro Card links
Create linked card to mirror a card in another projects / organization.
Create links with the attributes of the target card, or with its own attributes (to manage a card in multiple boards)
Create custom card relationship: blocked by, same as, etc.
Kantree also support infinite card hierarchy