Color

#183fcd

#183fcd
hex#183fcd
rgbrgb(24, 63, 205)
hslhsl(227, 79%, 45%)
oklchoklch(0.45 0.221 265.3)
Closest name: Denim (#2243b6)Relative luminance 0.0816

Tints & shades

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

Harmonies

Complementary

Open in tool →

#cda618

#189acd · #4b18cd

#cd183f · #3fcd18

Split-complementary

Open in tool →

#cd4b18 · #9acd18

#cd189a · #cda618 · #18cd4b

Contrast

#183fcd as textRatioAAAA largeAAAFix
Aaon white
7.98:1passpasspassPasses AAA — no fix needed.
Aaon black
2.63:1failfailfail
  • AA: use #486bea as the text (4.57:1)
  • AAA: use #7690ef as the text (7.01:1)
  • AA: or shift the background to #c4c4c4 (4.58:1)
  • AAA: or shift the background to #f0f0f0 (7:1)

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

Brands using this color

Fonts for this mood

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

mcpConnect your agent — build around #183fcd
live endpoint

Point any MCP client at the shared colors endpoint and your agent gets the same engine as this page — generate_palette, check_contrast, analyze_color — read-only, no key. Every palette it proposes comes with a /palettes/new/… link: open it, lock what you like, paste the link back.

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

analyze #183fcd and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link

tool url/palettes/new/183fcd-9ca0c4-df7a4e-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