For most Apple iOS versions (iPad, iPhone, etc.):

  • Go to the "iTunes" website.
  • Select the "Purchased" button at the bottom of the screen.
  • Find the Name of the App in the list.
  • The Publisher will be shown immediately below the APP Name.
  • The Version Number should be shown immediately below the publisher.

 

This information can be very beneficial, and often absolutely necessary when troubleshooting issues.