Hellatronic is described as a “fluorescent indigo with red/purple/blue color-shifting super sparkles.” It’s a cool-toned, violet-tinged blue with bluish-violet sparkle. Sephora My Boyfriend’s Jeans is bluer, darker, less sparkly. Sugarpill Velocity is bluer, matte. Urban Decay Chaos is slightly darker, less sparkly. MAC Dynamic Duo 2 #2 is darker, matte. MAC Cobalt is matte. Illamasqua Sadist is bluer, matte. See comparison swatches.