Color

#104af9

#104af9
hex#104af9
rgbrgb(16, 74, 249)
hslhsl(225, 95%, 52%)
oklchoklch(0.511 0.263 264.1)
Closest name: C64 Blue (#003aff)Relative luminance 0.1185

Colors that go with #104af9

Charcoal, Crimson 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 →

#f9bf10

#10bff9 · #4a10f9

#f9104a · #4af910

Split-complementary

Open in tool →

#f94a10 · #bff910

#f910bf · #f9bf10 · #10f94a

Contrast

#104af9 as textRatioAAAA largeAAAFix
Aaon white
6.23:1passpassfail
  • AAA: use #0640ef as the text (7.03:1)
Aaon black
3.37:1failpassfail
  • AA: use #3869fa as the text (4.57:1)
  • AAA: use #6f92fb as the text (7.18:1)
  • AA: or shift the background to #dbdbdb (4.5:1)

Fixes keep hue and saturation and move lightness only, so the suggestion stays on-brand. Ratios are symmetric: the same numbers apply with #104af9 as the background.

Brands using this color

Fonts for this mood

#104af9 reads as cool, vivid, technical. The font library is tagged with the same vocabulary:

mcpConnect your agent — build around #104af9
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 #104af9 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link

tool url/palettes/new/104af9-9ca1c4-df754e-221f2d-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