Ebook subscription startup Oyster expands to iPad and opens to all; some stats from Scribd

Oyster, the Peter Thiel-backed startup that aims to be a Netflix (s NFLX) for ebooks, was iPhone-only and invite-only for its first six weeks. On Wednesday, though, Oyster launched its iPad (s AAPL) app and opened up to everyone. And it is now offering a free 30-day trial of its service — which is essential, since consumers are still very unfamiliar with ebook subscription services.

When I reviewed Oyster six weeks ago, I was impressed by its design and its offerings — over 100,000 in-copyright ebooks for $9.95 a month. But I thought the app’s lack of availability on iPad was a big drawback because I think it’s hard to do serious reading on an iPhone. The launch on iPad remedies this problem, of course, and subscribers’ books will sync between both devices.

Oyster’s design on iPad is great, just as the iPhone app design is. One feature I liked is that you can tap to turn pages on the iPad app — it’s a gesture that anyone who’s used a touchscreen e-reader should be familiar with, and it’s easier than swiping.

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Oyster CEO Eric Stromberg and cofounder and chief product developer Willem Van Lancker wouldn’t tell me how many people have signed up for Oyster in its first six weeks. Van Lancker said the reaction has “exceeded all our expectations” and offered a semi-statistic: Ten days into launch, users had read 1 million pages; the second million pages were read in six days; and the third million were read in three days. Stromberg said that “in the initial push we saw a significant level of enthusiasm that translated to sign-ups” and that growth since then has been “very consistent.”

Oyster has also added some more content since launch. A few new publishers have joined — including “a couple small prestigious independents” — but the company wouldn’t name names. Stromberg said that many of the publishers who initially signed up with Oyster have added “lots of new titles” to the service since it launched, for example, “HarperCollins sent us a bunch more titles.”

Stromberg mentioned HarperCollins because, about a month ago, document-sharing site Scribd publicly launched its rival ebook subscription service, for $8.99 a month and with almost all of HarperCollins’ backlist (books over a year old). HarperCollins explained to me at the time that it chose to make more titles available to Scribd than to Oyster because Oyster is a startup, while Scribd, which was launched in 2007, already has about 80 million users and “the hardest thing is building audiences at scale.” Another bonus for HarperCollins was the fact that Scribd is available across platforms, including Android (s GOOG).

Scribd‘s ebook subscription service has been up and running quietly since January, and this week the company shared a few stats that provide some idea of how subscribers are using ebook services. Scribd’s “power user” reads about 10 books a month (though, according to information Scribd presented at the Frankfurt Book Fair, “power users” make up only about 2 percent of subscribers). For every book read completely, the company said, a user browsed an average of 4.5 other books. And check out the most popular devices for reading:

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That reiterates the importance of Oyster launching on iPad.