TickTick is a feature-rich task manager available on every major platform, offering natural language input, a built-in Pomodoro timer, habit tracking, calendar view, Eisenhower matrix, and collaboration — all at a fraction of the price of competitors. Founded in 2013, TickTick's aggressive feature parity with premium apps at a lower price made it the fastest-growing task manager of the past decade. Its built-in calendar integration and white-noise focus sounds make it one of the most complete all-in-one personal productivity tools available without breaking the bank.

Reference:

TickTick on Wikipedia

https://ticktick.com