Which version of the plugin should I use?

You might have noticed there are two different versions of the EWWW Image Optimizer for WordPress. The regular one that we call the "core" version, and then the Cloud version.

Previously, certain web hosts only allowed the Cloud edition, because there was some misconception about how EWWW IO operates. We have worked with these web hosts over the last couple years to clear up any confusion and to tighten up the security of the "core" EWWW Image Optimizer. As of January 2021, the Cloud edition will no longer receive updates and you should always use the core/regular version of EWWW Image Optimizer.