Elementor is the more common of the two in our index: it runs on 1,118 websites against 50 for Image Placeholders, and 8 sites use both. Counts come from real scans, not vendor claims.
Elementor is a website builder platform for professionals on WordPress.
Performance plugin from the WordPress Performance Team, which determines and stores the dominant color for newly uploaded images in the media library, then uses that as a placeholder background during front end image loads.
8 sites run both Elementor and Image Placeholders. That is 16% of the sites using Image Placeholders, the smaller of the two.
Want to know which one a particular site uses? Look it up and see its whole stack, or compare two sites side by side.