Autoptimize is the more common of the two in our index: it runs on 323 websites against 176 for Cloudflare Zaraz, and 4 sites use both. Counts come from real scans, not vendor claims.
Autoptimize is a WordPress plugin that optimises website performance by aggregating, minifying, and compressing HTML, CSS, and JavaScript files.
Cloudflare Zaraz gives you complete control over third-party tools and services for your website, and allows you to offload them to Cloudflare’s edge, improving the speed and security of your website.
4 sites run both Autoptimize and Cloudflare Zaraz. That is 2% of the sites using Cloudflare Zaraz, 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.