TickTick

ticktick.com

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Task manager combining to-do lists, a built-in Pomodoro timer, habit tracking, and calendar view in one free app.

Why it is useful

TickTick packs in features usually split across separate apps — timer, habit tracker, calendar — while keeping a generous free tier, making it a solid all-in-one option for anyone who doesn't want to pay for four separate subscriptions.