Color
#51809e
#51809ergb(81, 128, 158)hsl(203, 32%, 47%)oklch(0.578 0.069 237.7)Colors that go with #51809e
Charcoal, Copper 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 #51809e: softer than #000 and cool enough to feel like part of the same palette.
Amber #ffbf00
shippedAmber is paired with #51809e in 6 real palettes, including Beach Hut and Wired's brand system, as the supporting colour.
Blue #0000ff
shipped4 real palettes, including Activision's brand system and Qualcomm's brand system put Blue beside #51809e, as the accent.
Cobalt Blue #0047ab
shippedDesigners have shipped Cobalt Blue with #51809e: 6 real palettes, including Fintech Trust and Hershey's's brand system, as the lead colour.
Crimson #dc143c
shippedCrimson is paired with #51809e in 13 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 #51809e: 5 real palettes, including Deep Water and Telegram's brand system, as the lead colour.
Denim #1560bd
shippedDesigners have shipped Denim with #51809e: 16 real palettes, including Campus and Discover's brand system, as the lead colour.
Real palettes that use #51809e
Tints & shades
Harmonies
Contrast
| #51809e as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 4.26:1 | fail | pass | fail | |
Aaon black | 4.93:1 | pass | 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 #51809e 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 #51809e and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
/palettes/new/51809e-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