Todoist is the world's most popular dedicated task manager — a clean, cross-platform app with natural language input, recurring tasks, priority levels, labels, filters, and project hierarchies. Founded by Amir Salihefendic in 2007, it has grown to over 30 million users across every major platform. Its natural language parsing — type "submit report every Friday at 5pm" and the task schedules itself — remains best-in-class. Todoist's Karma system gamifies consistency, and its integrations with Gmail, Outlook, Slack, and calendar apps make it the hub of most personal productivity systems.

Reference:

Todoist on Wikipedia

https://todoist.com