Affinity Photo is a next-generation suite of award-winning software for creative professionals, professional photo editing software. So you can use Affinity Photo one of three ways on your Mac. One way is to run Affinity Photo and then open an image file and edit it in Affinity Photo. Another way is in the Photos app you can have an image selected and then go to Image, then Edit With, and then choose Affinity Photo.
A message from the Affinity team
As a way to lend support to the creative community during these difficult times, we’re once again offering a 90-day free trial of the Mac and Windows versions of the whole Affinity suite, for anyone who wants to use them (even those who have previously completed a free trial). We’re also bringing back the 50% discount for those who would prefer to buy and keep the apps, including our iPad versions.
More info 
about supporting the creative community initiative In other news…
our apps are fully optimized for the next generation of Mac
Affinity Photo Photo Editing Mac
Ready to go on Apple’s Big Sur and primed to deliver superfast performance on Macs with M1 chips, recent updates to the macOS versions of our apps mean huge performance gains.
Affinity Photo Application
Learn moreAffinity Photo Download
about Apple and Affinity updates