This lightning-fast task manager makes entering even the most complex to-dos unusually easy.

What we love: That you can add a task using natural language (“Call dentist next week”) – no drop-down menus or tapping around fields required. Todoist even understands more complex phrases such as “every two weeks” or “every third Wednesday of the month starting in January”.

Quick tip: Create a project to put together chore lists, organise assignments or separate work to-dos from personal ones. To add a task to a project, just include a related hashtag (#Work, #Shopping). For example, typing “Citizen Kane #Movies” will bring up your projects list so you can create a new one or select an existing one (such as “Movies to Watch”).

Meet the creator: Todoist started when founder Amir Salihefendić was a computer-science student and needed a way to track his studies and work. What began as a personal project now employs more than 100 people across 31 countries who help millions organise their lives.