This has nearly every feature under the sun. Its Achilles' heel is there is no way to sync all the information pertaining to tasks across devices or at least automatically back it up to the likes of Drive or Dropbox. Although it can sync with Google tasks  it can't edit Google Task categories  and most information pertaining to tasks can't be synchronised and backup is strictly manual. Also  comments and timer logs on a task seemingly can't be deleted.
January 22 2017