Swelter is a muted, medium-dark purple with subtle red undertones and a satiny sheen. It had decent to good color payoff, but it was a little stiff to work with. When I jabbed at it with a stiffer brush, I was able to get better color payoff. MAC Smoky Mauve is more frosted. Jasmine Carpet is very similar. NARS 413 BLKR #1 is grayer, cooler-toned. MAC Circa Plum is extremely similar.