Dusk
Open in tool →Slate blue with a copper accent — calm, professional, slightly editorial; suits consultancies and journals.
Color
#405b87
#405b87
hex
#405b87rgb
rgb(64, 91, 135)hsl
hsl(217, 36%, 39%)oklch
oklch(0.47 0.079 259.8)Closest name: Dusk (#4e5481)Relative luminance 0.1032
Colors that go with #405b87
Charcoal, Sea Green and Sienna 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 #405b87: softer than #000 and cool enough to feel like part of the same palette.
Sea Green #2e8b57
triadicshippedSea Green completes a triad with #405b87 — three hues spaced evenly round the wheel, the classic way to get energy into a palette without a clash.
Sienna #a0522d
complementaryshippedSienna sits directly opposite #405b87 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 #405b87 in 4 real palettes, including Lemon Squeezy's brand system and Warner Bros.'s brand system, as the lead colour — a combination designers have actually shipped, not a computed rotation.
Blue #0000ff
shippedBlue is paired with #405b87 in 4 real palettes, including CVS's brand system and Pixar's brand system, as the supporting colour — a combination designers have actually shipped, not a computed rotation.
Cobalt Blue #0047ab
shippedCobalt Blue is paired with #405b87 in 5 real palettes, including Fintech Trust and Glacier, as the lead colour — a combination designers have actually shipped, not a computed rotation.
Crimson #dc143c
shippedCrimson is paired with #405b87 in 11 real palettes, including Amazon's brand system and Codecademy's brand system, as the supporting colour — a combination designers have actually shipped, not a computed rotation.
Firebrick #b22222
shippedFirebrick is paired with #405b87 in 5 real palettes, including Wendy's's brand system and AT&T's brand system, as the supporting colour — a combination designers have actually shipped, not a computed rotation.
Real palettes that use #405b87
Tints & shades
Harmonies
Contrast
| #405b87 as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 6.85:1 | pass | pass | fail |
|
Aaon black | 3.06:1 | fail | 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 #405b87 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
#405b87 reads as cool, modern. The font library is tagged with the same vocabulary:
mcpConnect your agent — build around #405b87
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 #405b87 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
tool url
/palettes/new/405b87-9ca7c4-df624e-201f2d-e9f0f1?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