Color

#517ef0

#517ef0
hex#517ef0
rgbrgb(81, 126, 240)
hslhsl(223, 84%, 63%)
oklchoklch(0.62 0.178 265.3)
Closest name: Blue Öyster Cult (#5577ee)Relative luminance 0.2296

Colors that go with #517ef0

Charcoal, Red 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.

Tints & shades

Every swatch is its own page — click any to analyze it.

Harmonies

Complementary

Open in tool →

#f0c351

#51cef0 · #7451f0

#f0517e · #7ef051

Split-complementary

Open in tool →

#f07451 · #cef051

#f051ce · #f0c351 · #51f074

Contrast

#517ef0 as textRatioAAAA largeAAAFix
Aaon white
3.76:1failpassfail
  • AA: use #3a6dee as the text (4.56:1)
  • AAA: use #1249d3 as the text (7.19:1)
  • AA: or shift the background to #1c1c1c (4.54:1)
Aaon black
5.59:1passpassfail
  • AAA: use #6e93f2 as the text (7.12:1)

Fixes keep hue and saturation and move lightness only, so the suggestion stays on-brand. Ratios are symmetric: the same numbers apply with #517ef0 as the background.

Brands using this color

No public brand in the corpus uses this exact color yet. Extract a brand to add one.

Fonts for this mood

#517ef0 reads as cool, vivid, technical. The font library is tagged with the same vocabulary:

mcpConnect your agent — build around #517ef0
live endpoint

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.

endpointhttps://mcp.brandsweets.com/colors/mcp
claude mcp add --transport http brandsweets-colors https://mcp.brandsweets.com/colors/mcp
try this prompt

analyze #517ef0 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link

tool url/palettes/new/517ef0-9ca3c4-df704e-211f2d-e9eff1?lock=0&style=vibrant

Want the agent to remember your picks and write them into a living brand? Create a free BrandSweets workspace.

Machine-readable: color.md