Pocket wants to be your permanent digital library, for a price

Pocket, which lets you save articles and videos to view later, is introducing a paid option. Pocket Premium -- which offers power users new features for archiving, searching, and tagging their saves -- launches for $5 a month or $42 a year.

Seven years after the company began as a bookmarklet, and two years after making its apps free to build its base of customers, the save-for-later service says it's now big enough for a "freemium" business model to make sense. At a time when webpages routinely disappear without warning, Pocket is making a bet that users will pay for peace of mind. Whether the company is right will determine its fate as an independent business.