might be one early client. Other publishers -- as well as self-published authors -- can request access on Hiptype's website and will be invited to join in waves. The first book is free. After that, Hiptype will charge $19 per month per book for a basic package (including data from up to 1,000 readers and basic insights and trends) or $99 per month per book for a pro package (including data from up to 500,000 readers, detailed insights and trends, ad management and personalized backlist recommendations for readers). One possible concern is privacy. "We don't want to discourage the conversation about privacy," Levy said, noting that while all of the data Hiptype collects is anonymous, users can opt out completely. The company is also looking for ways it can improve its service for readers. In beta, end users have requested that Hiptype make its data available to them. For example, Levy said, a teacher could track how students are interacting with the books they've been assigned to read. It doesn't work everywhere yet Hiptype's largest limitation is that it doesn't work on every platform. The plugin only works on platforms that support HTML5 and allow Javascript to be embedded within a book. Apple, which supports EPUB3 and HTML5, is in. But e-ink devices, like Kindle and Nook e-readers, web-based readers like Kindle Cloud, and desktop e-reading platforms are out. Apple is estimated to have about 10 percent of the ebook market, with Kindle at 55 to 60 percent and Nook