So I created a small tool a while ago to learn Vue and to help me with this: https://roulettecarnival.com/ , it's not close to be finished but it kinda works. I also use it with my team to make trivial decisions more fun.
Site here: https://bracket-based-decision-making.firebaseapp.com/ Code here: https://github.com/weaversam8/bracket-based-decision-making
Very neat presentation. I often work out this sort of thing in my head or on paper.
I was confused by the wording initially. "Enter a list of what you want to decide" sounded to me like I should enter separate decisions ("What should I eat for lunch?", "When should I mow the lawn?", …). Perhaps word it as "Enter the alternatives you are trying to decide between".
It's the first item on the TODO list anyway.