Color
#51586c
#51586crgb(81, 88, 108)hsl(224, 14%, 37%)oklch(0.462 0.034 269.9)Colors that go with #51586c
Steel Blue, Blue and Cadet Blue 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.
Steel Blue #4682b4
analogousshippedSteel Blue is #51586c's neighbour on the wheel, so the two read as one family — use it for hover states, gradients and secondary surfaces.
Blue #0000ff
shipped6 real palettes, including Warp's brand system and Tesco's brand system put Blue beside #51586c, as the supporting colour.
Cadet Blue #5f9ea0
shippedDesigners have shipped Cadet Blue with #51586c: 4 real palettes, including Dusk and Open House, as the supporting colour.
Copper #b87333
shippedDesigners have shipped Copper with #51586c: 4 real palettes, including Desert Road and Dusk, as the lead colour.
Crimson #dc143c
shippedCrimson is paired with #51586c in 8 real palettes, including Codecademy's brand system and Gemstone, as the accent.
Denim #1560bd
shippedDesigners have shipped Denim with #51586c: 12 real palettes, including HP's brand system and The New York Times's brand system, as the accent.
Goldenrod #daa520
shippedGoldenrod shows up next to #51586c in 5 real palettes, including Open House and Fireside, as the accent.
White Smoke #f5f5f5
neutralWhite Smoke is the surface for #51586c: a clean near-white with no warm cast, so the cool hue stays clear instead of drifting muddy.
Real palettes that use #51586c
Tints & shades
Harmonies
Contrast
| #51586c as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 7.09:1 | pass | pass | pass | Passes AAA — no fix needed. |
Aaon black | 2.96:1 | fail | fail | fail |
Fixes keep hue and saturation and move lightness only, so the suggestion stays on-brand. Ratios are symmetric: the same numbers apply with #51586c as the background.
Brands using this color
Point 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.
https://mcp.brandsweets.com/colors/mcpclaude mcp add --transport http brandsweets-colors https://mcp.brandsweets.com/colors/mcp
›analyze #51586c and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
/palettes/new/51586c-9ca2c4-df724e-221f2d-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