Thanks @rkaplan, that is good to know. I’m experimenting with both Bookends and Zotero. One issue I can’t figure out with Bookends, but that worked easily with Zotera, is importing information from Amazon. I’ll search for the answer (you’re not my tech support, 
but it was surprisingly frustrating for a paid app vs a free one. I suspect that I’m missing something pretty easy but like I said, I’ll check it out. The book I was trying to import with Bookends without success is:
I tried “online search”, the Bookend browser, “Go to URL” and even dragging the URL into Bookends but nothing worked. All I got was this in Bookends:
Whereas in Zotero I got this:
