When comparing Waffle.io vs Casual, the Slant community recommends Casual for most people. In the question“What is the best task management software for small teams?” Casual is ranked 26th while Waffle.io is ranked 41st.
Specs
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Pros

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.
Pro Tracks task dependencies using a graph
Pro Great to-do templates
Every to-do list & project can be saved as an amazing template that you can re-use in the future.
Pro Offers a high-level overview of projects
The workflow with dependencies shows where the things are at a glance. No more frustrations of how your project is going and who is doing what.
Pro Sync deadlines to Google Calendar
To-do items can be integrated with your day-to-day schedule using Google Calendar.
Pro Visual way of organizing your work
The workflow includes dependencies and shows you where things are at a glance.
Cons
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.

Con Price
At its cheapest level, Casual is $9 per month for two users and two GB of storage. The trial period is short and there is no free version.
