MAC Relentlessly Red is a moderately warm-toned, very dark coral with a matte finish. It is a permanent lipstick that retails for $20.00 and contains 0.1 oz.
Relentlessly Red is described as a "bright pinkish coral matte." It's a brightened, medium-dark coral-red that almost looks cool-toned on me. It had opaque color payoff, and the consistency was slightly dry with some drag when applied but with firm pressure, it will slide across lips well enough. It lasted seven hours and left a stained behind. It was somewhat drying. MAC All Fired Up is definitely similar at a glance, and I think their undertones are slightly different, so it's going to be a shade that may look more or less similar depending on your coloring and natural color of your lips. All Fired Up is slightly pinker, less red/warm-toned but just barely. MAC Party Parrot is pinker. MAC Love Goddess is less matte. Guerlain Gigi is pinker, less matte. Guerlain Gourmandise is less red. See comparison swatches.
FURTHER READING: Formula Overview, which is a detailed review of the range as a whole.
Formulated to shade, define and showcase the lips, M·A·C Lipstick is available in every nuance of your favorite color and high-fashion texture. It's the iconic product that made M·A·C famous. AMPLIFIED CREME (A): Ultra-creamy. Quietly shiny. Color-packed! Hi-res: hi-impact. CREMESHEEN (C): Creme-based lipstick that imparts bright full color, with a soft and supple shine. FROST (F): Excellent color payoff with medium to high frosted shimmer-and-shine finish. LUSTRE (L): Demi-sheer with wet-look lustre finish. Very slick. Makes lips look soft, smooth, ultra-moist. MATTE (M): Pigment rich with intense color pay-off. No-shine, all matte finish. SATIN (S): Color-rich. Soft satin, semi-matte finish. Conditions while adding intense color.