Color

#1b393c

#1b393c
hex#1b393c
rgbrgb(27, 57, 60)
hslhsl(185, 38%, 17%)
oklchoklch(0.323 0.036 204)
Closest name: Royal Neptune (#1c3b42)Relative luminance 0.0349

Colors that go with #1b393c

Rust, Sienna and Steel Blue 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 →

#3c1e1b

#1b3c2e · #1b293c

#3c1b39 · #393c1b

Split-complementary

Open in tool →

#3c1b29 · #3c2e1b

#2e1b3c · #3c1e1b · #293c1b

Contrast

#1b393c as textRatioAAAA largeAAAFix
Aaon white
12.37:1passpasspassPasses AAA — no fix needed.
Aaon black
1.7:1failfailfail
  • AA: use #3c8086 as the text (4.62:1)
  • AAA: use #4da5ac as the text (7.29:1)
  • AA: or shift the background to #9c9c9c (4.51:1)
  • AAA: or shift the background to #c4c4c4 (7.09:1)

Fixes keep hue and saturation and move lightness only, so the suggestion stays on-brand. Ratios are symmetric: the same numbers apply with #1b393c as the background.

Brands using this color

Palettes built around it

Fonts for this mood

#1b393c reads as cool, dark, luxury. The font library is tagged with the same vocabulary:

mcpConnect your agent — build around #1b393c
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 #1b393c and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link

tool url/palettes/new/1b393c-a2b8be-df4e88-1f262d-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