Color
#516f81
#516f81rgb(81, 111, 129)hsl(203, 23%, 41%)oklch(0.525 0.045 235.1)Colors that go with #516f81
Charcoal, Sienna and Amber 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 #516f81: softer than #000 and cool enough to feel like part of the same palette.
Sienna #a0522d
complementaryshippedSienna sits directly opposite #516f81 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 #516f81 in 5 real palettes, including Lemon Squeezy's brand system and Beach Hut, as the lead colour.
Champagne #f7e7ce
shipped6 real palettes, including Forest Floor and Darkroom put Champagne beside #516f81, as that palette's text colour.
Cobalt Blue #0047ab
shippedDesigners have shipped Cobalt Blue with #516f81: 6 real palettes, including Ink & Paper and Fintech Trust, as the accent.
Copper #b87333
shippedDesigners have shipped Copper with #516f81: 6 real palettes, including Riverbed and Dusk, as the accent.
Crimson #dc143c
shippedCrimson is paired with #516f81 in 12 real palettes, including Retro Pop and Redfin's brand system, as the lead colour.
Deep Sky Blue #00bfff
shippedDesigners have shipped Deep Sky Blue with #516f81: 4 real palettes, including Deep Water and Venmo's brand system, as the lead colour.
Real palettes that use #516f81
Tints & shades
Harmonies
Contrast
| #516f81 as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 5.33:1 | pass | pass | fail |
|
Aaon black | 3.94:1 | 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 #516f81 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 #516f81 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
/palettes/new/516f81-9cb0c4-df4e5d-1f222d-e9f1f0?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