What are some alternatives?
When comparing Checkvist and WorkFlowy, you can also consider the following products
Zenkit - Zenkit is the home you always wanted for your ideas, your projects, your business.
Trello - Infinitely flexible. Incredibly easy to use. Great mobile apps. It's free. Trello keeps track of everything, from the big picture to the minute details.
Todoist - Todoist is a to-do list that helps you get organized, at work and in life.
Asana - Asana project management is an effort to re-imagine how we work together, through modern productivity software. Fast and versatile, Asana helps individuals and groups get more done.
Dynalist - Dynalist is a web app that lets you break down and organize your thoughts in the format of lists.
Remember The Milk - Remember The Milk is a task and time management application for mobile devices.