I've been using Google Keep - it has a list of checkboxes for this, they hide when checked. The upside is that you can drag-drop reorder then and you can add to the list from voice on the homescreen ("okay Google add book my vacation time to the Todo list").

But it fails one power of plain text rule - I can't copy and paste into and out of it. Sucks when I want to send snippets of my shopping list to my wife over sms.