As of 5/31/18, the Koios extension will no longer be supported. Please encourage your library to use our search marketing service instead. Libraries asked for our service to work for everyone in a geographic area, equally well on mobile and desktop, and without the need to install anything. Unfortunately, we can't do that with a browser extension. If you found the extension helpful, let us know at

Hi! Settings is still under construction.

Here's what you'll be able to do here when we're finished:

  • Save your library card information and preferred pick-up location
  • Choose where Koios works online (not just Amazon!)
  • Send eBooks to your tablet or eReader
  • Connect Goodreads, Twitter, and more


Pick which improvements you want to see first!

Where should Koios work next?
What do you want to see next from Koios?