Apple ya pide a los desarrolladores que envíen sus aplicaciones para OS X Yosemite

De momento solo está para OS X desde la versión OS X 10.7 Lion.

Pero si hay demanda lo adaptarán para Snow Leopard. Puedes comentarlo en su foro. Y saber si tienen prevista versión para Windows.

La verdad es que usa tecnologías clave de OS X como GCD, OpenCL, etc.

There are quite some technologies in OS X that are not available on Windows, things like Grand Central Dispatch, Open CL and so on. Without being a programmer I guess it is not easy to squeeze every possible optimization out of both systems while staying 100% compatible and featurewise identical.

Especially for Mac users history has shown that applications running on both operating systems don’t take advantage from technology that is only available on one of them (read: on OS X). Thus from a Mac user’s perspective quality would likely suffer and probably less people on the Mac side would buy a non-optimized Affinity Designer.

Adobe once was a great company. I think their decline in software quality (not in $) began as soon as they decided to go from Mac only to cross platform. Yes, they own a bigger market today and probably had to go this way albeit so many people have grown to dislike their bloated products and attitude.

Switching back to Affinity: From a marketing point of view it is a very good idea to stay focused and debut with a product (or a suite) that is the very best it can be on a given platform – even more so when competing with a de-facto monopolist that wants to be everything to everyone. I’d prefer a Mac speedboat over a cross-platform battleship anytime and surely I am not alone.

If the Affinity products will succeed in the Mac market (which I am sure of), Affinity can still decide to take the Adobe route and go cross-platform for the rest of the creative pro market.

https://affinity.serif.com/forum/index.php?/topic/744-windows-7-version-of-affinity-products/page-2?hl=central#entry3288