A long press is a function of time:
&quot;How long has the user pressed?&quot;<p>3D Touch is a function of pressure:
&quot;How hard has the user pressed?&quot;<p>In practice, things that your application previously accomplished with long presses may be more suitably accomplished with 3D Touch — things like contextual menus or shortcuts come to mind. Additionally, iOS has new APIs for presenting content using 3D Touch. The article briefly references them.