The publisher, which announced the news Thursday morning to Ad Age, plans to provide such metrics about 10 weeks after the tablet version of each issue appears.
Advertisers, who had been kept in the dark about readers' engagement with the tablet iterations of the titles, will now be told the number of paid tablet subscriptions and single-copy sales plus the number or readers who opened the tablet edition. In addition, Conde Nast will report the number of times readers opened the issue and how much time each reader spent with it.
Marketers will also get visibility into how many readers saw its ad, the number of times the ad was displayed to the reader, the average time readers spent with the ad and how that compares to the rest of the issue's ads.
The metrics include viewings on the iPad and the Kindle Fire and will soon include Barnes & Noble's Nook ereader as well.