This plugin use only PHP for images optimization and WebP conversion.
I do not know any other plugin with comparable capabilities/features that does not use external/cloud/remote service or execute binaries which is in general prohibited by hosting services. I made it for myself when ewww switched to commercial and reduced compression capabilities of free version.
No other plugin offer to review sub-sizes/thumbnails in real dimensions.
And other options you may find useful, like sharpening blurry WP thumbnails, automatic resizing, convert to sRGB etc.
You should test it, compare and decide for yourself.