App for comic collection - to prevent buying doubles

[Cobblepot]

What's a good app (android) for cataloging your comicbook collection? I have too many know that I often buy double issues and even trades.
I imagine I can whip up my smartphone, scan the barcode an see if I already own the book. (After I filed them all in that same way offcourse?)

Don't mind spending a few bucks on it, if it;s a agood stable one.