Agree with Gibberish and Misleading...
This app is completely separate from iOS Contacts; there is no integration point, and functionality within the app is limited unless you sign in to CamCard which likely means a copy on your entire Contacts database will be stored on their servers. I suspect the 3-5 star reviews reflect views that as a stand alone app this is a fairly easy way to capture business cards with reasonable accuracy, but not much more...
tomsonlineID about
CamCard - Business card scanner & reader, v5.5.1