Color

#37404e

#37404e
hex#37404e
rgbrgb(55, 64, 78)
hslhsl(217, 17%, 26%)
oklchoklch(0.369 0.027 259.2)
Closest name: Arsenic (#3b444b)Relative luminance 0.0503

Tints & shades

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

Harmonies

Complementary

Open in tool →

#4e4537

#374b4e · #3a374e

#4e3740 · #404e37

Split-complementary

Open in tool →

#4e3a37 · #4b4e37

#4e374b · #4e4537 · #374e3a

Contrast

#37404e as textRatioAAAA largeAAAFix
Aaon white
10.47:1passpasspassPasses AAA — no fix needed.
Aaon black
2.01:1failfailfail
  • AA: use #66768f as the text (4.55:1)
  • AAA: use #8b98ac as the text (7.18:1)
  • AA: or shift the background to #ababab (4.56:1)
  • AAA: or shift the background to #d4d4d4 (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 #37404e 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

#37404e reads as cool, muted, dark. The font library is tagged with the same vocabulary:

mcpConnect your agent — build around #37404e
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 #37404e and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link

tool url/palettes/new/37404e-9ca7c4-df624e-201f2d-e9f0f1?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