Color

#0a00cc

#0a00cc
hex#0a00cc
rgbrgb(10, 0, 204)
hslhsl(243, 100%, 40%)
oklchoklch(0.384 0.263 265.1)
Closest name: mediumblue (#0000cd)Relative luminance 0.0442

Tints & shades

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

Harmonies

Complementary

Open in tool →

#c2cc00

#005ccc · #7000cc

#cc0a00 · #00cc0a

Split-complementary

Open in tool →

#cc7000 · #5ccc00

#cc005c · #c2cc00 · #00cc70

Contrast

#0a00cc as textRatioAAAA largeAAAFix
Aaon white
11.14:1passpasspassPasses AAA — no fix needed.
Aaon black
1.88:1failfailfail
  • AA: use #645cff as the text (4.52:1)
  • AAA: use #908aff as the text (7.27:1)
  • AA: or shift the background to #a6a6a6 (4.58:1)
  • AAA: or shift the background to #cfcfcf (7.15:1)

Fixes keep hue and saturation and move lightness only, so the suggestion stays on-brand. Ratios are symmetric: the same numbers apply with #0a00cc as the background.

Brands using this color

Fonts for this mood

#0a00cc reads as cool, vivid, technical. The font library is tagged with the same vocabulary:

mcpConnect your agent — build around #0a00cc
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 #0a00cc and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link

tool url/palettes/new/0a00cc-a39cc4-dfa04e-261f2d-e9edf1?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