to b honest - I din't really need all the clever features of your app, because of how the Kobo app works, but amazon local are giving away a £2 app voucher today so, trusting that you get paid still! , I bought a copy to experiment with.
the free £2 voucher may be UK only - but here's the link:
http://www.amazon.co.uk/local/London-wide/B00JPFAE5C