Maybe you also realized bilions of to-do apps available on web or smartphone market. I tried many of them (Evernote, Samsung Memo, Notion, Tasks), but could not find the near-perfect solution. I stepped back and manage by hand some tasks with in Vi. I was impressed with the reasult and wanted improve. So, found Todotxt. I highly recomend the way it is designed–has missing features. I am using this web view from Jason Holt, @bicarbon8.