Color
#515e7b
#515e7brgb(81, 94, 123)hsl(221, 21%, 40%)oklch(0.483 0.05 265.8)Colors that go with #515e7b
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 #515e7b: softer than #000 and cool enough to feel like part of the same palette.
Sea Green #2e8b57
triadicshippedSea Green completes a triad with #515e7b — 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 #515e7b'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 #515e7b: 4 real palettes, including Dusk and Desert Road, as the accent.
Crimson #dc143c
shippedCrimson is paired with #515e7b in 11 real palettes, including Amazon's brand system and Retro Pop, as the supporting colour.
Denim #1560bd
shippedDesigners have shipped Denim with #515e7b: 10 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 #515e7b: 5 real palettes, including Fireside and Wendy's's brand system, as the lead colour.
Goldenrod #daa520
shippedGoldenrod shows up next to #515e7b in 4 real palettes, including Open House and Mid-Century, as the accent.
Real palettes that use #515e7b
Tints & shades
Harmonies
Contrast
| #515e7b as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 6.49:1 | pass | pass | fail |
|
Aaon black | 3.24:1 | 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 #515e7b 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 #515e7b and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
/palettes/new/515e7b-9ca4c4-df6b4e-211f2d-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