Fab is constantly updating its mobile app to encourage frequent checking in to the shopping site. The company now attributes 30% of its sales to the mobile platform. "For nearly a year now, we've been designing and building new features for Fab's mobile users first, and then taking those features to the Web. Building mobile-first forces us to think about how Fab will be used by people on the go first, and people at their desks second," says CEO Jason Goldberg.
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