Color

#031b3f

#031b3f
hex#031b3f
rgbrgb(3, 27, 63)
hslhsl(216, 91%, 13%)
oklchoklch(0.229 0.076 258)
Closest name: Midnight Mirage (#001f3f)Relative luminance 0.0116

Tints & shades

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

Harmonies

Complementary

Open in tool →

#3f2703

#03393f · #09033f

#3f031b · #1b3f03

Split-complementary

Open in tool →

#3f0903 · #393f03

#3f0339 · #3f2703 · #033f09

Contrast

#031b3f as textRatioAAAA largeAAAFix
Aaon white
17.04:1passpasspassPasses AAA — no fix needed.
Aaon black
1.23:1failfailfail
  • AA: use #156ef4 as the text (4.57:1)
  • AAA: use #5596f7 as the text (7.09:1)
  • AA: or shift the background to #858585 (4.62:1)
  • AAA: or shift the background to #a8a8a8 (7.17:1)

Fixes keep hue and saturation and move lightness only, so the suggestion stays on-brand. Ratios are symmetric: the same numbers apply with #031b3f 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

#031b3f reads as cool, vivid, dark. The font library is tagged with the same vocabulary:

mcpConnect your agent — build around #031b3f
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 #031b3f and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link

tool url/palettes/new/031b3f-9ca7c4-df5f4e-201f2d-e9f0f1?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