Color

#040cfb

#040cfb
hex#040cfb
rgbrgb(4, 12, 251)
hslhsl(238, 97%, 50%)
oklchoklch(0.451 0.306 264.4)
Closest name: blue (#0000ff)Relative luminance 0.0725

Tints & shades

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

Harmonies

Complementary

Open in tool →

#fbf304

#0488fb · #7704fb

#fb040c · #0cfb04

Split-complementary

Open in tool →

#fb7704 · #88fb04

#fb0488 · #fbf304 · #04fb77

Contrast

#040cfb as textRatioAAAA largeAAAFix
Aaon white
8.57:1passpasspassPasses AAA — no fix needed.
Aaon black
2.45:1failfailfail
  • AA: use #5e64fd as the text (4.72:1)
  • AAA: use #868afd as the text (7.07:1)
  • AA: or shift the background to #bdbdbd (4.56:1)
  • AAA: or shift the background to #ebebeb (7.19:1)

Fixes keep hue and saturation and move lightness only, so the suggestion stays on-brand. Ratios are symmetric: the same numbers apply with #040cfb as the background.

Brands using this color

Fonts for this mood

#040cfb reads as cool, vivid, technical. The font library is tagged with the same vocabulary:

mcpConnect your agent — build around #040cfb
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 #040cfb and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link

tool url/palettes/new/040cfb-9f9cc4-df944e-251f2d-e9edf1?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