Color

#001bcc

#001bcc
hex#001bcc
rgbrgb(0, 27, 204)
hslhsl(232, 100%, 40%)
oklchoklch(0.398 0.254 264.2)
Closest name: mediumblue (#0000cd)Relative luminance 0.0514

Colors that go with #001bcc

Charcoal, Crimson and Cornflower Blue 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 →

#ccb100

#0081cc · #4b00cc

#cc001b · #1bcc00

Split-complementary

Open in tool →

#cc4b00 · #81cc00

#cc0081 · #ccb100 · #00cc4b

Contrast

#001bcc as textRatioAAAA largeAAAFix
Aaon white
10.35:1passpasspassPasses AAA — no fix needed.
Aaon black
2.03:1failfailfail
  • AA: use #4d64ff as the text (4.58:1)
  • AAA: use #7a8cff as the text (7.02:1)
  • AA: or shift the background to #ababab (4.51:1)
  • AAA: or shift the background to #d6d6d6 (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 #001bcc as the background.

Brands using this color

Fonts for this mood

#001bcc reads as cool, vivid, technical. The font library is tagged with the same vocabulary:

mcpConnect your agent — build around #001bcc
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 #001bcc and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link

tool url/palettes/new/001bcc-9c9dc4-df864e-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