Color

#304cbb

#304cbb
hex#304cbb
rgbrgb(48, 76, 187)
hslhsl(228, 59%, 46%)
oklchoklch(0.465 0.178 267.9)
Closest name: Denim (#2243b6)Relative luminance 0.0939

Tints & shades

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

Harmonies

Complementary

Open in tool →

#bb9f30

#3091bb · #5a30bb

#bb304c · #4cbb30

Split-complementary

Open in tool →

#bb5a30 · #91bb30

#bb3091 · #bb9f30 · #30bb5a

Contrast

#304cbb as textRatioAAAA largeAAAFix
Aaon white
7.3:1passpasspassPasses AAA — no fix needed.
Aaon black
2.88:1failfailfail
  • AA: use #556ed3 as the text (4.56:1)
  • AAA: use #8194df as the text (7.23:1)
  • AA: or shift the background to #cccccc (4.55:1)
  • AAA: or shift the background to #fcfcfc (7.11:1)

Fixes keep hue and saturation and move lightness only, so the suggestion stays on-brand. Ratios are symmetric: the same numbers apply with #304cbb as the background.

Brands using this color

No public brand in the corpus uses this exact color yet. Extract a brand to add one.

Fonts for this mood

#304cbb reads as cool, modern. The font library is tagged with the same vocabulary:

mcpConnect your agent — build around #304cbb
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 #304cbb and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link

tool url/palettes/new/304cbb-9c9fc4-df7c4e-231f2d-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