Question: best to do list app for business?
Answer: Any.do. Let Any.do keep you and your team focused and on task. ... 
Evernote. Evernote is more of a note keeping resource, but you can set up to-do lists and some people have been clever enough to create GTD (David Allen's Getting Things Done) type lists using Evernote. ... 
Nirvana. ... 
Remember The Milk. ... 
Todoist. ... 
Vitalist. ... 
Wunderlust.