With their career retrospective Blur 21: The Box due on Friday, Blur have launched their own iPhone and iPad app to complement it. Blur: The App is available to download for free features rare and previously unreleased music, including demos and remixes, alongside archive video footage of band interviews and live performances. It also includes photo galleries, biographies, a career timeline, a comprehensive discography and videography, and a gigography with setlists powered by setlist.fm.