It is not an exaggeration to say that the colorful, customizable, syncable, endlessly-useful TickTick has changed my workflow, productivity, & life. There are some improvements I've hoped they'd make -- the ability to determine an est. amt of time for a task (aside from Pomodoro/calendar); including a habit tracker in the computer software in addition to the phone -- but it's 5 stars even with those elements lacking, and that's why I am a loyal customer who has recommended it to everyone I know.