It offers for free many features that are often available only in pro-versions elsewhere. MC Calendar is developed by MC Technologies. It is available for Android and iOS devices.
Main features

▪ Standard functionality for creating and managing calendar events such as setting recurrencies and reminders inviting attendees etc...
▪ Standard calendar views: day week month year agenda. Week view is available in two layouts - in a standard day-columns format and in a form of agenda. You can switch between them in one click. Also agenda and month views are combined for better user experience
▪ To-do list where you can sort filter and organize your tasks
▪ Drag-and-drop and event duration resizing. Drag-and-drop allows not only for standard intra-day rescheduling but also for automatic day or week swiping into the past of future by moving the grabbed event to the left or right corner of device screen
▪ Cloning events into multiple copies
▪ Graphical visualization of daily workload available in two formats in month and year views to ease the assessment of how many events you have for a given day
▪ Calendars management allowing for hiding/unhinding names and colors editing
▪ Day and night modes for the user interface
▪ Working hours highlighting in day and week views
▪ Other settings for customizing user experience such as highlighting working hours

Pro-version features 🔒

MC Calendar is available free of charge. However there are several premium features that can be unlocked for a monthly yearly or one-time payment:
▪ attaching files to scheduled events and tasks
▪ print
▪ five private calendars
▪ backup and data recovery
▪ optional screen lock
▪ conversion of tasks into events
▪ number of editable days displayed (week)
▪ week view in different formats
▪ business visualization
▪ sharing tasks and events
▪ edition of account for an existing event
▪ invitation of attendees to events