"Priorities" is the most effective to-do app you'll ever need. This method is used by famous investors and business people. If they can get by their schedules with this simple method for getting things done, we should be able to do it as well.
See, the productivity novices over-organize their tasks. They label everything, categorize everything, color code everything, mark items as favorites, bookmark, create well-structured folders, keep everything neat and tidy in multiple lists. The result? They never look at those tasks again.
"Priorities" changes that. Every day, you mindfully choose to focus on 3 to 5 most impactful tasks that will help you reach your goals. Then execute like crazy and actually do them.
Repeat this for long enough, you'll become as effective as one can be, and be happy that you didn't procrastinate by organizing tasks.
"Perfection is achieved, not when there is nothing more to add, but when there is nothing left to take away."