I'm not sure if you're looking for a to-do list app or you're actually looking for a project management app.
Some days ago there is a thread on dev.to that discuss the best project management, maybe you would like to take a look? dev.to/vicky209/what-is-the-best-f...
There are definitely some good to-do list apps out there, you just need to decide which features you would like to see in the app first.
We're a place where coders share, stay up-to-date and grow their careers.
We strive for transparency and don't collect excess data.