iGigBook Index contains the table of contents of over 70 popular fake and real books making it the most comprehensive index for Jazz Standards.
This app only allows you to search and determine which book a song is in as well as what page it appears on.
This app is not a PDF viewer.
If you have a tablet and are looking for a PDF viewer, check out iGigBook Sheet Music Manager. If you're looking for chord charts that transpose, the iGigBook Sheet Music Manager, offers as a free bonus, over 1,300 Jazz Chord Charts that you can transpose to any key. These are the charts that are currently available at http://www.jazzstudies.us.