Bluefire offers a sync option in both their Android & iOS apps if I recall correctly.
Quote:
Originally Posted by Tikker
I've got an extensive collection of books already and kobo and kindle will sync books purchased thru their bookstores but not already owned books
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Last I checked the Kindle app will sync books not from the Kindle store if they're uploaded to your Amazon cloud by using send to Kindle or emailing to the apps email address.