Chad Evans demonstrates the MLB At Batt app as Colorado Rockies Charlie Blackmon (highlighted) runs to second base at the top of the 7th inning at AT&T Park on Wednesday, Sept. 20, 2017, in San Francisco, Calif. Major League Baseball tech executives gave a preview of the new augmented reality portion of the MLB At Bat app, which uses Apple's new ARKit technology. This gives fans at games the ability to use iPhones and iPads to see how big a lead a runner has off first, highlight situations where a steal is likely, see real-time defensive positioning, understand the defensive range of the fielders, and see the gaps where hits would be likely.