Retro Pop
Open in tool →Fifties-diner red and steel blue with a peach — nostalgic pop that still passes contrast.
Color
#427ca9
#427ca9
hex
#427ca9rgb
rgb(66, 124, 169)hsl
hsl(206, 44%, 46%)oklch
oklch(0.567 0.093 243.9)Closest name: Blue Triumph (#4376ab)Relative luminance 0.1844
Colors that go with #427ca9
Charcoal, Royal Blue and Rust lead the list. Each partner is a real named colour with the reason it works — a wheel relationship, a neutral that carries it, or a pairing lifted from a palette or brand system that actually shipped — and every pair opens in the palette tool.
Charcoal #36454f
neutralshippedCharcoal is the text near-black for #427ca9: softer than #000 and cool enough to feel like part of the same palette.
Royal Blue #4169e1
analogousshippedRoyal Blue is #427ca9's neighbour on the wheel, so the two read as one family — use it for hover states, gradients and secondary surfaces.
Rust #b7410e
split-complementshippedRust is a split-complement of #427ca9: nearly opposite, so it still pops against it, without the vibrating edge of a true complement.
Sienna #a0522d
complementaryshippedSienna sits directly opposite #427ca9 on the wheel — the strongest contrast one hue can give another, so use it small: a button, a link colour, one highlight.
Amber #ffbf00
shippedAmber is paired with #427ca9 in 9 real palettes, including Beach Hut and Wired's brand system, as the supporting colour.
Blue #0000ff
shipped4 real palettes, including Activision's brand system and Pixar's brand system put Blue beside #427ca9, as the accent.
Cobalt Blue #0047ab
shippedDesigners have shipped Cobalt Blue with #427ca9: 8 real palettes, including Hershey's's brand system and Glacier, as the supporting colour.
Copper #b87333
shippedDesigners have shipped Copper with #427ca9: 4 real palettes, including Notion's brand system and Dusk.
Real palettes that use #427ca9
Tints & shades
Harmonies
Contrast
| #427ca9 as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 4.48:1 | fail | pass | fail | |
Aaon black | 4.69:1 | pass | pass | fail |
|
Fixes keep hue and saturation and move lightness only, so the suggestion stays on-brand. Ratios are symmetric: the same numbers apply with #427ca9 as the background.
Brands using this color
No public brand in the corpus uses this exact color yet. Extract a brand to add one.
Palettes built around it
Fonts for this mood
#427ca9 reads as cool, modern. The font library is tagged with the same vocabulary:
mcpConnect your agent — build around #427ca9
live endpointPoint any MCP client at the shared colors endpoint and your agent gets the same engine as this page — direct_palette, edit_direction, check_palette, check_contrast — read-only, no key. Every direction it proposes comes with a /colors/d/… link: open it, lock what you like, paste the link back, and the agent edits rather than re-rolls.
endpoint
https://mcp.brandsweets.com/colors/mcpclaude mcp add --transport http brandsweets-colors https://mcp.brandsweets.com/colors/mcp
try this prompt
›analyze #427ca9 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
tool url
/palettes/new/427ca9-9caec4-df4e56-1f212d-e9f1f1?lock=0&style=vibrantWant the agent to remember your picks and write them into a living brand? Create a free BrandSweets workspace.
Machine-readable: color.md