{Mac\TeX\ design philosophy vs. TeXShop design philosophy} {Richard Koch} {The philosophy driving Mac\TeX\ and the philosophy driving TeXShop are completely different. What's the difference, and why? Mac\TeX: We install the platform-independent version of \TeX\ Live, identical to the \TeX\ available on all other platforms, and not modified in any way for the Mac. TeXShop: The front end to \TeX\ has modern features Apple recently introduced and users expect, and makes no bones about compatibility with front ends on other platforms. Details: Why was TeXShop written using Cocoa and does it matter? (You bet it matters.) Why was it converted to 64 bits and did that matter? (Sure does.) Does TeXShop support automatic saving, automatic reloading of documents when restarting, and the Retina display? Yes, yes, and yes. How hard were they to do? (They came for free because of the first items in this paragraph.) Is TeXShop constructed using recent features of Objective~C such as properties and automatic reference counting? (We had to be dragged there kicking and screaming, but yes, as of April, 2014.) Why do these matter? Will TeXShop support features of the new system Apple might unveil at \acro{WWDC} in June, 2014? (How would I know, and yes, of course.)}