I have the GoodReads app on my phone and it has the BEST feature!  It has a barcode scan. I can scan any book barcode and it pulls up the book so I can read reviews, add it to my "to read" list, or whatever.  I love this app.  I use it A LOT.  People ask me how I know about books and what I might want to read? I use this app every time I am in a library or store and I scan it real quick if it looks interesting enough and then I either add it or move on.  This is how I "hear" about books and authors I might not otherwise.  Today I went to Barnes & Noble and added 10 books to my "to read" list in a matter of minutes.  I love this! I love that this is how I get introduced to new-to-me authors and books that I might not run across otherwise. How about you?  What app do you love and are grateful for?