The iPhone equivalent of Todo.txt for me is the Notes app. Ironically the reason Todo.txt behavior exists is because all the other Todo apps try to be Todo apps

The iPhone equivalent of Todo.txt for me is the Notes app. Ironically the reason Todo.txt behavior exists is because all the other Todo apps try to be Todo apps, including this one. Sometimes I just want a blank sheet with no Todo magic. That is why I use Notepad and the Notes app.