The problem was solved by Google Docs years ago. It already gives me access from any browser and all my devices via Drive. Just import your todo.txt as a Docs d

The problem was solved by Google Docs years ago. It already gives me access from any browser and all my devices via Drive. Just import your todo.txt as a Docs document and your done. Full change/revision log. Completely free form - zero imposition of a format or task flow beyond what you impose on yourself, which may be nothing more than dumping down your thoughts and reviewing them occasionally. IMO its the only viable solution and i wouldn't consider using anything else.