Thanks! It's incredibly exciting for us to finally share Hiptype with the world and start getting more authors and publishers using the product.
We've been particularly interested with what the HN crowd would think about things made possible with Hiptype, like A/B testing or beta testing versions of a book.
Could this work in a hybrid app for iOS? Specifically, we publish a hybrid iPad app using an open source framework called Baker (http://bakerframework.com/). I know a lot of people publish books using it as well. Only problem is, Google Analytics doesn't track HTML pageviews inside an app, and most in-app analytics are geared towards native apps. Setting up analytics is painful.