Color

#031f3f

#031f3f
hex#031f3f
rgbrgb(3, 31, 63)
hslhsl(212, 91%, 13%)
oklchoklch(0.24 0.07 254)
Closest name: Midnight Mirage (#001f3f)Relative luminance 0.0136

Tints & shades

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

Harmonies

Complementary

Open in tool →

#3f2303

#033d3f · #05033f

#3f031f · #1f3f03

Split-complementary

Open in tool →

#3f0503 · #3d3f03

#3f033d · #3f2303 · #033f05

Contrast

#031f3f as textRatioAAAA largeAAAFix
Aaon white
16.51:1passpasspassPasses AAA — no fix needed.
Aaon black
1.27:1failfailfail
  • AA: use #0b71e5 as the text (4.51:1)
  • AAA: use #4698f6 as the text (7.08:1)
  • AA: or shift the background to #878787 (4.6:1)
  • AAA: or shift the background to #ababab (7.19:1)

Fixes keep hue and saturation and move lightness only, so the suggestion stays on-brand. Ratios are symmetric: the same numbers apply with #031f3f as the background.

Brands using this color

No public brand in the corpus uses this exact color yet. Extract a brand to add one.

Palettes built around it

Fonts for this mood

#031f3f reads as cool, vivid, dark. The font library is tagged with the same vocabulary:

mcpConnect your agent — build around #031f3f
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 #031f3f and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link

tool url/palettes/new/031f3f-9caac4-df564e-1f202d-e9f1f1?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