What are the best apps for integrating tasks and calendar events in one interface for both Mac and iOS?

A personal to-do app with features like to-do list, dbeautiful place for your - Tasks - Todo lists - Projects. Daily kanban, color coding, tags, calendar, backlog etc. Best for people who don't like super complicated task management apps and wants something easy to us & calendar for your day to day tasks, Boards for your projects, Backlog for the things you missed, Inbox for mind dump and much more.