As wearable devices gain acceptance, we need to ask, What will user interfaces look like in a post-smartphone world? Will these future interfaces support sophisticated interactions in a mobile context? The authors draw from visual analytics concepts to address the growing need for individuals to manage information on personal devices. Spatial analytic interfaces (SAIs) can leverage the benefits of spatial interaction to enable everyday visual analytics tasks to be performed in-situ, at the most beneficial place and time. They explore the possibilities for such interfaces using head-worn display technology and discuss current developments and future research goals for the successful development of SAIs.