Dusk
Open in tool →Slate blue with a copper accent — calm, professional, slightly editorial; suits consultancies and journals.
Color
#555d91
#555d91
hex
#555d91rgb
rgb(85, 93, 145)hsl
hsl(232, 26%, 45%)oklch
oklch(0.495 0.084 276.2)Closest name: Berry Jam (#655883)Relative luminance 0.118
Colors that go with #555d91
Charcoal, Sea Green and Amber 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 #555d91: softer than #000 and cool enough to feel like part of the same palette.
Sea Green #2e8b57
triadicshippedSea Green completes a triad with #555d91 — three hues spaced evenly round the wheel, the classic way to get energy into a palette without a clash.
Amber #ffbf00
shippedAmber is paired with #555d91 in 7 real palettes, including McDonald's's brand system and Warner Bros.'s brand system, as the lead colour.
Blue #0000ff
shipped4 real palettes, including Activision's brand system and Pixar's brand system put Blue beside #555d91, as the accent.
Cobalt Blue #0047ab
shippedDesigners have shipped Cobalt Blue with #555d91: 6 real palettes, including Fintech Trust and Glacier, as the lead colour.
Crimson #dc143c
shippedCrimson is paired with #555d91 in 15 real palettes, including Wells Fargo's brand system and McDonald's's brand system, as the lead colour.
Firebrick #b22222
shippedDesigners have shipped Firebrick with #555d91: 6 real palettes, including Campbell's's brand system and AT&T's brand system, as the supporting colour.
Medium Sea Green #3cb371
shippedMedium Sea Green is paired with #555d91 in 5 real palettes, including Fintech Trust and Indigo SaaS, as the accent.
Real palettes that use #555d91
Tints & shades
Harmonies
Contrast
| #555d91 as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 6.25:1 | pass | pass | fail |
|
Aaon black | 3.36:1 | 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 #555d91 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 #555d91
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 #555d91 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
tool url
/palettes/new/555d91-9c9dc4-df864e-231f2d-e9eef1?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