Color

#042fa4

#042fa4
hex#042fa4
rgbrgb(4, 47, 164)
hslhsl(224, 95%, 33%)
oklchoklch(0.376 0.191 263.6)
Closest name: Blue Hour (#0034ab)Relative luminance 0.0474

Tints & shades

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

Harmonies

Complementary

Open in tool →

#a47904

#047fa4 · #2a04a4

#a4042f · #2fa404

Split-complementary

Open in tool →

#a42a04 · #7fa404

#a4047f · #a47904 · #04a42a

Contrast

#042fa4 as textRatioAAAA largeAAAFix
Aaon white
10.78:1passpasspassPasses AAA — no fix needed.
Aaon black
1.95:1failfailfail
  • AA: use #3368fa as the text (4.5:1)
  • AAA: use #6a91fb as the text (7.06:1)
  • AA: or shift the background to #a8a8a8 (4.53:1)
  • AAA: or shift the background to #d1d1d1 (7.06:1)

Fixes keep hue and saturation and move lightness only, so the suggestion stays on-brand. Ratios are symmetric: the same numbers apply with #042fa4 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

#042fa4 reads as cool, vivid, technical. The font library is tagged with the same vocabulary:

mcpConnect your agent — build around #042fa4
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 #042fa4 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link

tool url/palettes/new/042fa4-9ca2c4-df724e-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