LeanLabs Kanban vs notion.so: What are the differences?
Developers describe LeanLabs Kanban as "Free, open source, self-hosted, Kanban board for GitLab issues". Leanlabs kanban is built from the ground up using the GitLab public API. Kanban issues are GitLab issues, you will never have to deal with synchronization problems. Keep issues where they belong, in the repository with your code!. On the other hand, notion.so is detailed as "A unified workspace for docs, wikis, and tasks – designed for modern teams". A new tool that blends your everyday work apps into one. It's a unified and collaborative workspace for you and your team.
LeanLabs Kanban and notion.so belong to "Project Management" category of the tech stack.