TickTick is a free mobile productivity and time management app that helps you create a task list and manage your time effectively. You can create lists of tasks, add them to your calendar, and break them down into itemised checklists. Customisable reminders stop you forgetting your appointments. The app allows you to customise its display with personal themes, making your task lists match your individual style. This is the free version of the app some features are unavailable unless you upgrade to the fuller-featured Pro version.