Color

#3d00cc

#3d00cc
hex#3d00cc
rgbrgb(61, 0, 204)
hslhsl(258, 100%, 40%)
oklchoklch(0.409 0.251 278)
Closest name: Busty Blue (#3300cc)Relative luminance 0.0535

Tints & shades

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

Harmonies

Complementary

Open in tool →

#8fcc00

#0029cc · #a300cc

#cc3d00 · #00cc3d

Split-complementary

Open in tool →

#cca300 · #29cc00

#cc0029 · #8fcc00 · #00cca3

Contrast

#3d00cc as textRatioAAAA largeAAAFix
Aaon white
10.14:1passpasspassPasses AAA — no fix needed.
Aaon black
2.07:1failfailfail
  • AA: use #8652ff as the text (4.66:1)
  • AAA: use #a680ff as the text (7.15:1)
  • AA: or shift the background to #adadad (4.52:1)
  • AAA: or shift the background to #d9d9d9 (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 #3d00cc 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

#3d00cc reads as cool, vivid, technical. The font library is tagged with the same vocabulary:

mcpConnect your agent — build around #3d00cc
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 #3d00cc and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link

tool url/palettes/new/3d00cc-ad9cc4-dfc44e-291f2d-e9ebf1?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