Though infrequently updated - and going to check his website and toss him a few dollars if he accepts. For FREE(!) this app is beyond all expectations. I have over 1300 books in it. the ability to sync to good reads (at least receive from  believe send to is broken)  cross reference with library things  keep track of loans to people  and backup reminders (and the backups work!) are an amazing value. Let me explain the basic process. 1.) Download this app and good reads app 2.) link to goodreads and librarythings 3.) Open good reads and use their UPC scanner to scan in everything you own indiscriminately. Try to organize on teh good reads side if you feel inclined. 4.) Sync from good reads (one way  if send is still broken) - all books  their covers  synopsis  page count - all data is now in book catalogue. You can search by auther  borrowed  and more. Saves me from re-buying books - since 1300 is a little hard to keep track of. Furthermore  unlike the good reads app - this works offline. I can also give a copy to friends if they want to borrow they have a copy of my database. My favorite android app - yes  synergy between others  but the developer did it!
September 14 2015