The launch of a new free smartphone-friendly version of The Guardian's website may have led to a drop-off in paid-for subscribers to the paper's iPhone app. The app, which costs £3.99 for six months, attracted just over 57,000 users in the year to March, down from 82,000 a year earlier. In November, The Guardian rolled out a new mobile version of the site using responsive design to optimise the reading experience on all mobile devices.