When comparing ZenHub.io vs Waffle.io, the Slant community recommends ZenHub.io for most people. In the question“What are the best GitHub-based project management solutions?” ZenHub.io is ranked 9th while Waffle.io is ranked 13th. The most important reason people chose ZenHub.io is:
As a chrome extension, ZenHub offers integration directly into the GitHub Issues user interface. You can view your boards without leaving GitHub.
Specs
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Pros
Pro Integrated in GitHub Issues UI
As a chrome extension, ZenHub offers integration directly into the GitHub Issues user interface. You can view your boards without leaving GitHub.
Pro Free for public repos
Any public GitHub repositories can use the software for free.
Pro Links GitHub issues with a Kanban board
Existing GitHub issues can be used to create tasks and managed in a more convenient Kanban style.
Pro Real-time
Each update is visible as soon as it is made.
Cons
Con Only supports Chrome
It's integration directly into the GitHub UI only supports Chrome (it's a chrome extension).
Con Managing large project may be difficult
Waffle works best with medium to small projects and very high-level general overviews and less with projects that require very granular management due to the fact that it becomes considerably more difficult to keep track of various cards and priorities as they are pushed off screen very quickly.