This is the ultimate task management tool in the sense that it is absolutely extreme. It is meant to be used by people who have serious problems focusing on these tasks that they should see to.
Single Task hopes to do something about that by making them concentrate on one task only, and hiding all the other tasks from view. Only when the task at hand is completed will the next one be displayed.
Alternatively, the user can browse through tasks by using a toggle button. But at no point will more than one task be displayed simultaneously.
And in order not to distract users whose attention span is already compromised, the site offers a really sparse layout, and a very limited set of functionalities. The only operations that can be performed in addition to the ones mentioned above are editing any task that has been created, and deleting it altogether. And that is it. If you are looking for something more than that, then look elsewhere.
SingleTask.org In Their Own Words
SingleTask.org lets you create a list of tasks but forces you to focus on the current task to help you stay productive.
Why SingleTask.org It Might Be A Killer
There are no other task management tools that are this specific.
Some Questions About SingleTask.org
To which extent can such a limited approach be successful? 
