On my phone, undoubtedly. Gotta be honest, I am the kind of person who usually copes with everyday work and study on my phone. I can do lots of things on it. By the way, making a list is an important part of my personal life, you know, I am doing this pretty well. Since I was a primary school student, I started to make a list at that time, not everyday, but once a week maybe. Till now, I make some lists then put them in my apps. So, effective and efficient to me. That is it.