Theodore Gray

2011 has been a fascinating year for book-apps, as publishers and developers experimented with multimedia and interactive features, and wrestled with the challenge of selling enough apps to recoup the investment in those features.

The Elements remains the biggest success story of the book-apps world. Its publisher Touch Press has sold more than 250,000 downloads of its flagship iOS app, bringing in more than $2m of revenues for the company according to chief executive Max Whitby.

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