Color

#1b3b41

#1b3b41
hex#1b3b41
rgbrgb(27, 59, 65)
hslhsl(189, 41%, 18%)
oklchoklch(0.331 0.039 211.2)
Closest name: Royal Neptune (#1c3b42)Relative luminance 0.0374

Tints & shades

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

Harmonies

Complementary

Open in tool →

#41211b

#1b4134 · #1b2841

#411b3b · #3b411b

Split-complementary

Open in tool →

#411b28 · #41341b

#341b41 · #41211b · #28411b

Contrast

#1b3b41 as textRatioAAAA largeAAAFix
Aaon white
12.01:1passpasspassPasses AAA — no fix needed.
Aaon black
1.75:1failfailfail
  • AA: use #3b808c as the text (4.65:1)
  • AAA: use #4aa1b0 as the text (7.02:1)
  • AA: or shift the background to #a1a1a1 (4.65:1)
  • AAA: or shift the background to #c7c7c7 (7.1:1)

Fixes keep hue and saturation and move lightness only, so the suggestion stays on-brand. Ratios are symmetric: the same numbers apply with #1b3b41 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

#1b3b41 reads as cool, dark, luxury. The font library is tagged with the same vocabulary:

mcpConnect your agent — build around #1b3b41
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 #1b3b41 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link

tool url/palettes/new/1b3b41-a2b7be-df4e7e-1f252d-e9f1ee?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