Dusk
Open in tool →Slate blue with a copper accent — calm, professional, slightly editorial; suits consultancies and journals.
Color
#455a82
#455a82
hex
#455a82rgb
rgb(69, 90, 130)hsl
hsl(219, 31%, 39%)oklch
oklch(0.468 0.07 262.7)Closest name: Deep Indigo (#4c567a)Relative luminance 0.1019
Colors that go with #455a82
Sea Green, Sienna 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.
Sea Green #2e8b57
triadicshippedSea Green completes a triad with #455a82 — 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 #455a82 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 #455a82 in 4 real palettes, including McDonald's's brand system and Lemon Squeezy's brand system, as the lead colour.
Blue #0000ff
shipped5 real palettes, including Tesco's brand system and Activision's brand system put Blue beside #455a82, as the supporting colour.
Cobalt Blue #0047ab
shippedDesigners have shipped Cobalt Blue with #455a82: 6 real palettes, including Fintech Trust and Unilever's brand system, as the lead colour.
Crimson #dc143c
shippedCrimson is paired with #455a82 in 16 real palettes, including Walgreens's brand system and Costco's brand system, as the lead colour.
Firebrick #b22222
shippedDesigners have shipped Firebrick with #455a82: 6 real palettes, including Wendy's's brand system and Fireside, as the supporting colour.
White Smoke #f5f5f5
neutralWhite Smoke is the surface for #455a82: a clean near-white with no warm cast, so the cool hue stays clear instead of drifting muddy.
Real palettes that use #455a82
Tints & shades
Harmonies
Contrast
| #455a82 as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 6.91:1 | pass | pass | fail |
|
Aaon black | 3.04:1 | 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 #455a82 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 #455a82
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 #455a82 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
tool url
/palettes/new/455a82-9ca5c4-df664e-211f2d-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