Color

#03403f

#03403f
hex#03403f
rgbrgb(3, 64, 63)
hslhsl(179, 91%, 13%)
oklchoklch(0.337 0.056 193)
Closest name: Rich Black (#004040)Relative luminance 0.0405

Tints & shades

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

Harmonies

Complementary

Open in tool →

#3f0304

#033f20 · #03223f

#3e033f · #3f3e03

Split-complementary

Open in tool →

#3f0322 · #3f2003

#20033f · #3f0304 · #223f03

Contrast

#03403f as textRatioAAAA largeAAAFix
Aaon white
11.61:1passpasspassPasses AAA — no fix needed.
Aaon black
1.81:1failfailfail
  • AA: use #068481 as the text (4.63:1)
  • AAA: use #08aaa8 as the text (7.33:1)
  • AA: or shift the background to #a3a3a3 (4.6:1)
  • AAA: or shift the background to #c9c9c9 (7.01:1)

Fixes keep hue and saturation and move lightness only, so the suggestion stays on-brand. Ratios are symmetric: the same numbers apply with #03403f as the background.

Brands using this color

Fonts for this mood

#03403f reads as vivid, dark, luxury. The font library is tagged with the same vocabulary:

mcpConnect your agent — build around #03403f
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 #03403f and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link

tool url/palettes/new/03403f-a2bbbe-d45996-1f272d-e9f1ed?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