Side by side view of autumnleaf colorscheme in xterm, xterm with CSApprox, and gvim

Side by side view of brookstream colorscheme in urxvt, urxvt with CSApprox, and gvim

uRxvt supports only 88 colors by default, so the approximation is coarser than for xterm-256color

autumnleaf again - in xterm with CSApprox and bold/italic disabled, and in gvim