Color

#0b4151

#0b4151
hex#0b4151
rgbrgb(11, 65, 81)
hslhsl(194, 76%, 18%)
oklchoklch(0.35 0.06 223)
Closest name: Cold and Dark (#154250)Relative luminance 0.0445

Colors that go with #0b4151

Crimson, Denim and Teal lead the list. Each partner is a real named colour with the reason it works — a wheel relationship, a neutral that carries it, or a pairing lifted from a palette or brand system that actually shipped — and every pair opens in the palette tool.

Tints & shades

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

Harmonies

Complementary

Open in tool →

#511b0b

#0b513e · #0b1e51

#510b41 · #41510b

Split-complementary

Open in tool →

#510b1e · #513e0b

#3e0b51 · #511b0b · #1e510b

Contrast

#0b4151 as textRatioAAAA largeAAAFix
Aaon white
11.12:1passpasspassPasses AAA — no fix needed.
Aaon black
1.89:1failfailfail
  • AA: use #1681a2 as the text (4.7:1)
  • AAA: use #1ca1ca as the text (7:1)
  • AA: or shift the background to #a6a6a6 (4.57:1)
  • AAA: or shift the background to #cfcfcf (7.14:1)

Fixes keep hue and saturation and move lightness only, so the suggestion stays on-brand. Ratios are symmetric: the same numbers apply with #0b4151 as the background.

Brands using this color

Fonts for this mood

#0b4151 reads as cool, vivid, dark. The font library is tagged with the same vocabulary:

mcpConnect your agent — build around #0b4151
live endpoint

Point any MCP client at the shared colors endpoint and your agent gets the same engine as this page — direct_palette, edit_direction, check_palette, check_contrast — read-only, no key. Every direction it proposes comes with a /colors/d/… link: open it, lock what you like, paste the link back, and the agent edits rather than re-rolls.

endpointhttps://mcp.brandsweets.com/colors/mcp
claude mcp add --transport http brandsweets-colors https://mcp.brandsweets.com/colors/mcp
try this prompt

analyze #0b4151 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link

tool url/palettes/new/0b4151-9cb6c4-df4e72-1f242d-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