Todoist is a project management application for personal and professional productivity. It allows users to manage their tasks from a smartphone, tablet or computer. The app is free, though additional features to enable collaboration are available in a paid version. Todoist was created in 2007 by startup Doist. As of June 2014, it has 2 million users.
In Todoist, tasks are either aligned to projects or sit loosely in an inbox. Projects may contain other sub-projects, and tasks may contain sub-tasks. Tasks can be filtered by label, date or priority. Completion of tasks results in "karma" points being awarded to the user, introducing an element of gamification.