From their website:
We started with a vision for a better textbook: one that was interactive and engaging, one that took advantage of the opportunities afforded by new media like iPad. But we aren’t just reinventing publishing, or reinventing the book. We’re reinventing the way people learn.
Inkling began in the living room of our founder and quickly grew to a handful of designers and engineers in a tiny office in San Francisco’s startuppy SoMa district. Here, ideas and sketches were translated into a touchable textbook experience, designed to make the most of iPad.