Color

#1d1b31

#1d1b31
hex#1d1b31
rgbrgb(29, 27, 49)
hslhsl(245, 29%, 15%)
oklchoklch(0.236 0.042 286.9)
Closest name: Dark Knight (#151931)Relative luminance 0.0127

Tints & shades

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

Harmonies

Complementary

Open in tool →

#2f311b

#1b2431 · #281b31

#311d1b · #1b311d

Split-complementary

Open in tool →

#31281b · #24311b

#311b24 · #2f311b · #1b3128

Contrast

#1d1b31 as textRatioAAAA largeAAAFix
Aaon white
16.75:1passpasspassPasses AAA — no fix needed.
Aaon black
1.25:1failfailfail
  • AA: use #746eaf as the text (4.59:1)
  • AAA: use #9792c3 as the text (7.22:1)
  • AA: or shift the background to #858585 (4.54:1)
  • AAA: or shift the background to #a8a8a8 (7.05:1)

Fixes keep hue and saturation and move lightness only, so the suggestion stays on-brand. Ratios are symmetric: the same numbers apply with #1d1b31 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

#1d1b31 reads as cool, muted, dark. The font library is tagged with the same vocabulary:

mcpConnect your agent — build around #1d1b31
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 #1d1b31 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link

tool url/palettes/new/1d1b31-a49cc4-dfa54e-261f2d-e9ecf1?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