Coco Blue is a light-medium sky blue with barely-there white micro-shimmer. I used three coats for mostly opaque color, but I found the formula to be prone to streaks. The drying time was longer, too, so the polish pulled in places. Chanel Riva is much, much lighter and has less blue tones. Nubar Blue Hydrangea is more similar than Riva, but it’s more vibrant and more of a robin’s egg blue.