Color

#183afb

#183afb
hex#183afb
rgbrgb(24, 58, 251)
hslhsl(231, 97%, 54%)
oklchoklch(0.492 0.279 265.6)
Closest name: C64 Blue (#003aff)Relative luminance 0.1019

Colors that go with #183afb

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 →

#fbd918

#18acfb · #6818fb

#fb183a · #3afb18

Split-complementary

Open in tool →

#fb6818 · #acfb18

#fb18ac · #fbd918 · #18fb68

Contrast

#183afb as textRatioAAAA largeAAAFix
Aaon white
6.91:1passpassfail
  • AAA: use #1336fb as the text (7.12:1)
Aaon black
3.04:1failpassfail
  • AA: use #4a65fc as the text (4.56:1)
  • AAA: use #7c90fd as the text (7.26:1)
  • AA: or shift the background to #d1d1d1 (4.53:1)

Fixes keep hue and saturation and move lightness only, so the suggestion stays on-brand. Ratios are symmetric: the same numbers apply with #183afb as the background.

Brands using this color

Fonts for this mood

#183afb reads as cool, vivid, technical. The font library is tagged with the same vocabulary:

mcpConnect your agent — build around #183afb
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 #183afb and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link

tool url/palettes/new/183afb-9c9ec4-df834e-231f2d-e9eef1?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