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Chores is a simple utility to help track progress on recurring chores. While it has some overlap with calendars and to-do lists, it is focused on tasks which are required periodically, but aren't tied to a specific time on a calendar.
When you add a chore to the list, you specify it's first due date and it's required frequency. Then, whenever you mark a chore complete, it will update the chore to reflect the next due date (based on frequency), and push it to the bottom of the list.