Your use of > rather than ≥ correctly indicates that Affinity is not a Photoshop alternative at all (going by other comments about how it's not even available on Linux).
Just like Photoshop it has multiple softwares, Affinity is the brand name. It has a rastor program and and vector program, as well as a third software I think is like light room
Affinity Designer is an Illustrator alternative, Affinity Photo is their Photoshop competitor and Affinity Publisher is an InDesign clone. The company that makes the Affinity products is called Serif. Hope this helps to clarify.