Color
#515b6c
#515b6crgb(81, 91, 108)hsl(218, 14%, 37%)oklch(0.469 0.03 261)Colors that go with #515b6c
Sienna, 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.
Sienna #a0522d
complementaryshippedSienna sits directly opposite #515b6c on the wheel — the strongest contrast one hue can give another, so use it small: a button, a link colour, one highlight.
Blue #0000ff
shipped6 real palettes, including Warp's brand system and Tesco's brand system put Blue beside #515b6c, as the supporting colour.
Cadet Blue #5f9ea0
shippedDesigners have shipped Cadet Blue with #515b6c: 4 real palettes, including Dusk and Open House, as the supporting colour.
Champagne #f7e7ce
shipped4 real palettes, including Darkroom and BrandSweets's brand system put Champagne beside #515b6c, as the surface under it.
Copper #b87333
shippedDesigners have shipped Copper with #515b6c: 4 real palettes, including Desert Road and Dusk, as the lead colour.
Crimson #dc143c
shippedCrimson is paired with #515b6c in 9 real palettes, including Codecademy's brand system and Gemstone, as the accent.
Dark Goldenrod #b8860b
shipped4 real palettes, including Puma's brand system and Cider put Dark Goldenrod beside #515b6c, as the supporting colour.
White Smoke #f5f5f5
neutralWhite Smoke is the surface for #515b6c: a clean near-white with no warm cast, so the cool hue stays clear instead of drifting muddy.
Real palettes that use #515b6c
Tints & shades
Harmonies
Contrast
| #515b6c as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 6.86:1 | 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 #515b6c 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 #515b6c and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
/palettes/new/515b6c-9ca6c4-df644e-201f2d-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