Color

#031f4e

#031f4e
hex#031f4e
rgbrgb(3, 31, 78)
hslhsl(218, 93%, 16%)
oklchoklch(0.253 0.093 259.8)
Closest name: Dark Soul (#112255)Relative luminance 0.0155

Tints & shades

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

Harmonies

Complementary

Open in tool →

#4f3303

#03454f · #0d034f

#4f031f · #1f4f03

Split-complementary

Open in tool →

#4f0d03 · #454f03

#4f0345 · #4f3303 · #034f0d

Contrast

#031f4e as textRatioAAAA largeAAAFix
Aaon white
16.03:1passpasspassPasses AAA — no fix needed.
Aaon black
1.31:1failfailfail
  • AA: use #1d6df7 as the text (4.58:1)
  • AAA: use #5d96f9 as the text (7.2:1)
  • AA: or shift the background to #8a8a8a (4.64:1)
  • AAA: or shift the background to #adadad (7.14:1)

Fixes keep hue and saturation and move lightness only, so the suggestion stays on-brand. Ratios are symmetric: the same numbers apply with #031f4e 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

#031f4e reads as cool, vivid, dark. The font library is tagged with the same vocabulary:

mcpConnect your agent — build around #031f4e
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 #031f4e and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link

tool url/palettes/new/031f4e-9ca6c4-df644e-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