Color
#51597b
#51597brgb(81, 89, 123)hsl(229, 21%, 40%)oklch(0.471 0.056 273.9)Colors that go with #51597b
Sea Green, Steel Blue and Copper 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 #51597b — three hues spaced evenly round the wheel, the classic way to get energy into a palette without a clash.
Steel Blue #4682b4
analogousshippedSteel Blue is #51597b's neighbour on the wheel, so the two read as one family — use it for hover states, gradients and secondary surfaces.
Copper #b87333
shippedDesigners have shipped Copper with #51597b: 4 real palettes, including Dusk and Desert Road, as the accent.
Crimson #dc143c
shippedCrimson is paired with #51597b in 10 real palettes, including Amazon's brand system and Codecademy's brand system, as the supporting colour.
Denim #1560bd
shippedDesigners have shipped Denim with #51597b: 11 real palettes, including HP's brand system and The New York Times's brand system, as the accent.
Firebrick #b22222
shippedDesigners have shipped Firebrick with #51597b: 5 real palettes, including Fireside and Wendy's's brand system, as the lead colour.
Goldenrod #daa520
shippedGoldenrod shows up next to #51597b in 4 real palettes, including Open House and Mid-Century, as the accent.
White Smoke #f5f5f5
neutralWhite Smoke is the surface for #51597b: a clean near-white with no warm cast, so the cool hue stays clear instead of drifting muddy.
Real palettes that use #51597b
Tints & shades
Harmonies
Contrast
| #51597b 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 #51597b as the background.
Brands using this color
No public brand in the corpus uses this exact color yet. Extract a brand to add one.
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 #51597b and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
/palettes/new/51597b-9c9fc4-df7e4e-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