Retro Pop
Open in tool →Fifties-diner red and steel blue with a peach — nostalgic pop that still passes contrast.
Color
#517da4
#517da4
hex
#517da4rgb
rgb(81, 125, 164)hsl
hsl(208, 34%, 48%)oklch
oklch(0.574 0.078 246.4)Closest name: steelblue (#4682b4)Relative luminance 0.191
Colors that go with #517da4
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 #517da4: softer than #000 and cool enough to feel like part of the same palette.
Copper #b87333
complementaryshippedCopper sits directly opposite #517da4 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 #517da4 in 8 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 #517da4, as the accent.
Cobalt Blue #0047ab
shippedDesigners have shipped Cobalt Blue with #517da4: 7 real palettes, including Fintech Trust and Hershey's's brand system, as the lead colour.
Crimson #dc143c
shippedCrimson is paired with #517da4 in 15 real palettes, including Retro Pop and Wendy's's brand system, as the lead colour.
Deep Sky Blue #00bfff
shippedDesigners have shipped Deep Sky Blue with #517da4: 5 real palettes, including Deep Water and Astro's brand system, as the lead colour.
Denim #1560bd
shippedDesigners have shipped Denim with #517da4: 15 real palettes, including Campus and Discover's brand system, as the lead colour.
Real palettes that use #517da4
Tints & shades
Harmonies
Contrast
| #517da4 as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 4.36:1 | fail | pass | fail | |
Aaon black | 4.82:1 | 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 #517da4 as the background.
Brands using this color
No public brand in the corpus uses this exact color yet. Extract a brand to add one.
Palettes built around it
mcpConnect your agent — build around #517da4
live endpointPoint 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.
endpoint
https://mcp.brandsweets.com/colors/mcpclaude mcp add --transport http brandsweets-colors https://mcp.brandsweets.com/colors/mcp
try this prompt
›analyze #517da4 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
tool url
/palettes/new/517da4-9cadc4-df4e51-1f212d-e9f1f1?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