Color
#516381
#516381rgb(81, 99, 129)hsl(218, 23%, 41%)oklch(0.497 0.053 260.5)Colors that go with #516381
Charcoal, Sea Green and Sienna 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 #516381: softer than #000 and cool enough to feel like part of the same palette.
Sea Green #2e8b57
triadicshippedSea Green completes a triad with #516381 — three hues spaced evenly round the wheel, the classic way to get energy into a palette without a clash.
Sienna #a0522d
complementaryshippedSienna sits directly opposite #516381 on the wheel — the strongest contrast one hue can give another, so use it small: a button, a link colour, one highlight.
Amber #ffbf00
shippedAmber is paired with #516381 in 4 real palettes, including Lemon Squeezy's brand system and Warner Bros.'s brand system, as the lead colour.
Champagne #f7e7ce
shipped4 real palettes, including Darkroom and BrandSweets's brand system put Champagne beside #516381, as the surface under it.
Cobalt Blue #0047ab
shippedDesigners have shipped Cobalt Blue with #516381: 5 real palettes, including Fintech Trust and Ink & Paper, as the lead colour.
Copper #b87333
shippedDesigners have shipped Copper with #516381: 4 real palettes, including Dusk and Desert Road, as the accent.
Crimson #dc143c
shippedCrimson is paired with #516381 in 12 real palettes, including Amazon's brand system and Retro Pop, as the supporting colour.
Real palettes that use #516381
Tints & shades
Harmonies
Contrast
| #516381 as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 6.08:1 | pass | pass | fail |
|
Aaon black | 3.45:1 | 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 #516381 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 #516381 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
/palettes/new/516381-9ca6c4-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