Dusk
Open in tool →Slate blue with a copper accent — calm, professional, slightly editorial; suits consultancies and journals.
Color
#515e90
#515e90
hex
#515e90rgb
rgb(81, 94, 144)hsl
hsl(228, 28%, 44%)oklch
oklch(0.493 0.082 272)Closest name: Dusk (#4e5481)Relative luminance 0.1177
Colors that go with #515e90
Charcoal, Sea Green and Dark Olive Green 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 #515e90: softer than #000 and cool enough to feel like part of the same palette.
Sea Green #2e8b57
triadicshippedSea Green completes a triad with #515e90 — three hues spaced evenly round the wheel, the classic way to get energy into a palette without a clash.
Dark Olive Green #556b2f
complementaryshippedDark Olive Green sits directly opposite #515e90 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 #515e90 in 6 real palettes, including Warner Bros.'s brand system and Lemon Squeezy's brand system, as the accent.
Cobalt Blue #0047ab
shippedDesigners have shipped Cobalt Blue with #515e90: 5 real palettes, including Fintech Trust and Glacier, as the lead colour.
Crimson #dc143c
shippedCrimson is paired with #515e90 in 12 real palettes, including Amazon's brand system and Netflix's brand system, as the supporting colour.
Firebrick #b22222
shippedDesigners have shipped Firebrick with #515e90: 6 real palettes, including Campbell's's brand system and AT&T's brand system, as the supporting colour.
Goldenrod #daa520
shippedGoldenrod shows up next to #515e90 in 4 real palettes, including Open House and Sapphire & Gold, as the accent.
Real palettes that use #515e90
Tints & shades
Harmonies
Contrast
| #515e90 as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 6.26:1 | pass | pass | fail |
|
Aaon black | 3.35:1 | 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 #515e90 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
mcpConnect your agent — build around #515e90
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 #515e90 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
tool url
/palettes/new/515e90-9c9fc4-df7c4e-231f2d-e9eff1?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