ColourPop Kapow is a moderately cool-toned, dark taupe with a matte finish. It is a permanent lipstick that retails for $6.50 and contains 0.11 oz.
ColourPop Kapow Ultra Matte Liquid Lipstick ($6.00 for 0.11 fl. oz.) is described as a "muted greey taupe." It's a medium-dark, purpled taupe with neutral-to-cool undertones and a matte finish. This was less of a flat matte finish and more of your traditional matte finish, and this shade had a much longer drying time compared to a lot of the range, so you'll need to be careful as it dries down to avoid pressing your lips together or else the color will lift/flake off where the lips meet. I had very slight "cracking" with this shade after an hour and a half of wear. It was fairly comfortable to wear until four hours, where it felt a bit drying,a nd it lasted for seven hours. Maybelline Gone Greige (DC, $7.49) is lighter, warmer (80% similar). Anastasia Grim (P, $20.00) is darker, less glossy (90% similar). MAC Simply Smoked (P, $21.00) is more muted (85% similar). Makeup Geek Misfit (P, $12.00) is cooler (85% similar). Obsessive Compulsive Cosmetics Sebastian (DC, $18.00) is lighter, more muted, glossier (85% similar). MAC Deep Rooted (P, $19.00) is darker, cooler (80% similar). Maybelline Concrete Jungle (P, $7.49) is cooler (80% similar). MAC Gwendolyn (LE, $19.00) is darker, cooler (80% similar). Anastasia Resin (P, $18.00) is darker, cooler (80% similar). ColourPop Trap (P, $6.50) is lighter, cooler (80% similar). See comparison swatches / view dupes side-by-side.
FURTHER READING: Formula Overview, which is a detailed review of the range as a whole.