Color

#04adfb

#04adfb
hex#04adfb
rgbrgb(4, 173, 251)
hslhsl(199, 97%, 50%)
oklchoklch(0.712 0.161 239.5)
Closest name: Cerulean (#55aaee)Relative luminance 0.3688

Tints & shades

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

Harmonies

Complementary

Open in tool →

#fb5204

#04fbce · #0431fb

#fb04ad · #adfb04

Split-complementary

Open in tool →

#fb0431 · #fbce04

#ce04fb · #fb5204 · #31fb04

Contrast

#04adfb as textRatioAAAA largeAAAFix
Aaon white
2.51:1failfailfail
  • AA: use #037cb5 as the text (4.61:1)
  • AAA: use #025d88 as the text (7.18:1)
  • AA: or shift the background to #383838 (4.68:1)
  • AAA: or shift the background to #171717 (7.15:1)
Aaon black
8.38:1passpasspassPasses AAA — no fix needed.

Fixes keep hue and saturation and move lightness only, so the suggestion stays on-brand. Ratios are symmetric: the same numbers apply with #04adfb as the background.

Brands using this color

Palettes built around it

Fonts for this mood

#04adfb reads as cool, vivid, technical. The font library is tagged with the same vocabulary:

mcpConnect your agent — build around #04adfb
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 #04adfb and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link

tool url/palettes/new/04adfb-9cb3c4-df4e66-1f232d-e9f1f0?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