SFMOMA’s chief content officer, Chad Coerver, calls the app “a cross between This American Life and the movie Her.” And indeed it cops to its slightly eerie capabilities at the outset. When you fire up the app, the voice of public radio veteran Marianne McCune greets you: “The guides will tell you where to go. They’ll wait for you, because they know where you are too. [awkward pause] Oh, that sounds creepy—it’s not.”