Color
#515b7b
#515b7brgb(81, 91, 123)hsl(226, 21%, 40%)oklch(0.476 0.053 270.9)Colors that go with #515b7b
Charcoal, Sea Green and Steel 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.
Charcoal #36454f
neutralshippedCharcoal is the text near-black for #515b7b: softer than #000 and cool enough to feel like part of the same palette.
Sea Green #2e8b57
triadicshippedSea Green completes a triad with #515b7b — 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 #515b7b's neighbour on the wheel, so the two read as one family — use it for hover states, gradients and secondary surfaces.
Blue #0000ff
shipped4 real palettes, including Activision's brand system and Tesco's brand system put Blue beside #515b7b, as the accent.
Cobalt Blue #0047ab
shippedDesigners have shipped Cobalt Blue with #515b7b: 4 real palettes, including Fintech Trust and Ink & Paper, as the lead colour.
Copper #b87333
shippedDesigners have shipped Copper with #515b7b: 4 real palettes, including Dusk and Desert Road, as the accent.
Crimson #dc143c
shippedCrimson is paired with #515b7b in 15 real palettes, including Codecademy's brand system and Wells Fargo's brand system, as the accent.
Denim #1560bd
shippedDesigners have shipped Denim with #515b7b: 15 real palettes, including HP's brand system and The New York Times's brand system, as the accent.
Real palettes that use #515b7b
Tints & shades
Harmonies
Contrast
| #515b7b as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 6.7:1 | pass | pass | fail |
|
Aaon black | 3.13:1 | 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 #515b7b 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 #515b7b and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
/palettes/new/515b7b-9ca1c4-df774e-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