Nitpicking, but The Daily uses JSON describing page layouts which map pretty closely to UIKit objects and properties. No Postscript, no PDF. You can see this

Nitpicking, but The Daily uses JSON describing page layouts which map pretty closely to UIKit objects and properties. No Postscript, no PDF. You can see this for yourself if you let Charles or any kind of wire sniffer observe the network traffic while The Daily loads a new issue.