Seaside
#66a4b0
About Seaside
Seaside feels like morning light sitting on the surface of calm water. It's notably lighter than Atlas Cedar, but it doesn't go as airy as Blue Eye Samurai, so it holds a steady presence without turning washed out. Compared to Finnish Fiord, it's less warm and less cyan-forward, with a cooler, sea-glass undertone that reads clean rather than friendly-coral warm.
I use it when I need that in-between balance for buttons, card headers, and subtle surface fills in dashboards and finance apps. It works well as a secondary UI color in SaaS and health platforms where you want calm reinforcement, not a strong accent. It's also a nice fit for chart backgrounds and annotation pills in light layouts, because it stays legible and doesn't steal focus.
Quirk to watch: on very cool monitors it can lean a touch more gray-blue, so pair it with grays that aren't already too blue or everything starts to feel samey. The upside is that it's the shade I reach for when the layout needs consistent, seaworthy calm across multiple components.
Variations
Shades
Darker variations, created by mixing toward black.
Tints
Lighter variations, created by mixing toward white.
Tones
Muted variations, created by reducing saturation.
Hues
Hue rotations around the color wheel.
Temperatures
Warm and cool shifts of this color.
Color harmonies
Suggested palettes
Palettes built around this color.