The Apple II was not capable of high-resolution color, with or without the 80-column card. You would have used the 80-column card with a monochrome monitor. I don't remember whether I ever used it personally.
I couldn't find any pictures of Kaypros with color screens. Was it uncommon?
Ahh, yes, the parent of your post..."The memory resources must have been tight, because the original Mac had like a 512x342 pixel display, not even enough to display a full page width of text."
My thought was, “Why didn’t the Mac have color?” and I was comparing it to color systems that had similar or better resolution than the Mac… and I think that’s only EGA, and maybe some workstations I don’t know about.
The year before, someone demonstrated a Lisa at my college, and of course I was excited by what I was reading in Byte Magazine (though it was over my head), but the early Mac was just out of my reach. The Sanyo seemed like a step above my mom's Apple II.
The IBM PCjr also came out the same year as the Mac and the 128KB model supported 640x200 with 4 colors (and up to 320x200 with 16). A lot less expensive than a PC with EGA.
The IBM EGA card came out in 1984, same year as the Mac, and supported 640x350 with 16 colors, but I think the cost of the monitor + card was somewhere around $1K, and the 640x350@4bpp mode was only supported if you also bought a RAM expansion daughterboard. The Mac’s launch price was $2,500, for comparison.
Adjusting for inflation, the EGA card was something around $2,500 in 2020 dollars, and the Mac was around $6,200.