@nprofile1q... ImageOptim is truly amazing, and I use it all the time. It’s exceptionally good at crunching down the size of PNGs that have limited color depth (which is usually the kinds of images I am wanting to compress most). But, yeah, not being able to fiddle with some things like the exact color palette, dithering options, etc, and without any preview, leaves me still wanting something else.

Affinity’s export tool is probably the thing that’s closest to what I want, but that also doesn’t check all the boxes (no animations, no dithering options, the custom color palette option has been broken as long as I’ve known about it).