Color

#37434e

#37434e
hex#37434e
rgbrgb(55, 67, 78)
hslhsl(209, 17%, 26%)
oklchoklch(0.377 0.025 246.2)
Closest name: Arsenic (#3b444b)Relative luminance 0.0538

Tints & shades

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

Harmonies

Complementary

Open in tool →

#4e4237

#374e4d · #37374e

#4e3743 · #434e37

Split-complementary

Open in tool →

#4e3737 · #4e4d37

#4d374e · #4e4237 · #374e37

Contrast

#37434e as textRatioAAAA largeAAAFix
Aaon white
10.12:1passpasspassPasses AAA — no fix needed.
Aaon black
2.08:1failfailfail
  • AA: use #63798c as the text (4.64:1)
  • AAA: use #889aaa as the text (7.25:1)
  • AA: or shift the background to #adadad (4.51:1)
  • AAA: or shift the background to #d9d9d9 (7.17:1)

Fixes keep hue and saturation and move lightness only, so the suggestion stays on-brand. Ratios are symmetric: the same numbers apply with #37434e 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

#37434e reads as cool, muted, dark. The font library is tagged with the same vocabulary:

mcpConnect your agent — build around #37434e
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 #37434e and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link

tool url/palettes/new/37434e-9cacc4-df4e4e-1f212d-e9f1f1?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