Color

#00255c

#00255c
hex#00255c
rgbrgb(0, 37, 92)
hslhsl(216, 100%, 18%)
oklchoklch(0.28 0.107 258.7)
Closest name: Black Sea Night (#052462)Relative luminance 0.021

Tints & shades

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

Harmonies

Complementary

Open in tool →

#5c3700

#00535c · #09005c

#5c0025 · #255c00

Split-complementary

Open in tool →

#5c0900 · #535c00

#5c0053 · #5c3700 · #005c09

Contrast

#00255c as textRatioAAAA largeAAAFix
Aaon white
14.8:1passpasspassPasses AAA — no fix needed.
Aaon black
1.42:1failfailfail
  • AA: use #0a6cff as the text (4.6:1)
  • AAA: use #5297ff as the text (7.23:1)
  • AA: or shift the background to #8f8f8f (4.58:1)
  • AAA: or shift the background to #b3b3b3 (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 #00255c 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

#00255c reads as cool, vivid, dark. The font library is tagged with the same vocabulary:

mcpConnect your agent — build around #00255c
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 #00255c and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link

tool url/palettes/new/00255c-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