Color

#1f343d

#1f343d
hex#1f343d
rgbrgb(31, 52, 61)
hslhsl(198, 33%, 18%)
oklchoklch(0.311 0.031 226.9)
Closest name: Blue Whale (#1e3442)Relative luminance 0.0308

Tints & shades

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

Harmonies

Complementary

Open in tool →

#3d281f

#1f3d37 · #1f253d

#3d1f34 · #343d1f

Split-complementary

Open in tool →

#3d1f25 · #3d371f

#371f3d · #3d281f · #253d1f

Contrast

#1f343d as textRatioAAAA largeAAAFix
Aaon white
12.99:1passpasspassPasses AAA — no fix needed.
Aaon black
1.62:1failfailfail
  • AA: use #497c92 as the text (4.58:1)
  • AAA: use #6a9eb4 as the text (7.16:1)
  • AA: or shift the background to #999999 (4.56:1)
  • AAA: or shift the background to #bfbfbf (7.06:1)

Fixes keep hue and saturation and move lightness only, so the suggestion stays on-brand. Ratios are symmetric: the same numbers apply with #1f343d as the background.

Brands using this color

Fonts for this mood

#1f343d reads as cool, muted, dark. The font library is tagged with the same vocabulary:

mcpConnect your agent — build around #1f343d
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 #1f343d and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link

tool url/palettes/new/1f343d-9cb3c4-df4e69-1f232d-e9f1f0?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