Imgix is the more common of the two in our index: it runs on 173 websites against 155 for Arc XP. Counts come from real scans, not vendor claims.
Arc XP is a cloud-based digital experience platform that helps enterprise companies, retail brands and media and entertainment organization create and distribute content, drive digital commerce, and deliver powerful experiences.
Imgix is a visual media platform for managing, processing, rendering, optimising and delivering your existing images.
Want to know which one a particular site uses? Look it up and see its whole stack, or compare two sites side by side.