I use Calibre on desktop, sync’d to dropbox, and use the Marvin app on my phone. I like it a lot better than the iBooks app. It has features like search and tag

I use Calibre on desktop, sync’d to dropbox, and use the Marvin app on my phone. I like it a lot better than the iBooks app. It has features like search and tagging/collections. The only thing it doesn’t do that I wish it did was handle PDFs.