Who is this site for?
This site gives you an overview of the features supported by various image optimization tools and services.
This should help you get on the right track for your next optimized site, but also act as a guide for how to compare what you do today with best practices.
Which tool is best?
It's complicated! 😀
The best tool for you depends on what you need. Some tools are better for libraries. Some tools have more, better maintained plugins than others. Some are easier to get started with, whereas others are easier to extend and configure.
Were tooling authors involved with this?
This site was built by folks on the Google Chrome developer relations team, but the folks who build and work at the tooling and services being covered were given early access and gave feedback.