Color

#0b181d

#0b181d
hex#0b181d
rgbrgb(11, 24, 29)
hslhsl(197, 45%, 8%)
oklchoklch(0.2 0.021 224.5)
Closest name: Black Stallion (#0e191c)Relative luminance 0.0081

Tints & shades

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

Harmonies

Complementary

Open in tool →

#1e100b

#0b1e1a · #0b0f1e

#1e0b18 · #181e0b

Split-complementary

Open in tool →

#1e0b0f · #1e1a0b

#1a0b1e · #1e100b · #0f1e0b

Contrast

#0b181d as textRatioAAAA largeAAAFix
Aaon white
18.06:1passpasspassPasses AAA — no fix needed.
Aaon black
1.16:1failfailfail
  • AA: use #3a7d98 as the text (4.57:1)
  • AAA: use #519fbd as the text (7.04:1)
  • AA: or shift the background to #808080 (4.57:1)
  • AAA: or shift the background to #a3a3a3 (7.16:1)

Fixes keep hue and saturation and move lightness only, so the suggestion stays on-brand. Ratios are symmetric: the same numbers apply with #0b181d as the background.

Brands using this color

Palettes built around it

Fonts for this mood

#0b181d reads as cool, dark, luxury. The font library is tagged with the same vocabulary:

mcpConnect your agent — build around #0b181d
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 #0b181d and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link

tool url/palettes/new/0b181d-9cb4c4-df4e6b-1f232d-e9f1ef?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