Color

#15039b

#15039b
hex#15039b
rgbrgb(21, 3, 155)
hslhsl(247, 96%, 31%)
oklchoklch(0.321 0.21 268.7)
Closest name: Everlasting Night (#000099)Relative luminance 0.0259

Tints & shades

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

Harmonies

Complementary

Open in tool →

#899b03

#033d9b · #61039b

#9b1503 · #039b15

Split-complementary

Open in tool →

#9b6103 · #3d9b03

#9b033d · #899b03 · #039b61

Contrast

#15039b as textRatioAAAA largeAAAFix
Aaon white
13.83:1passpasspassPasses AAA — no fix needed.
Aaon black
1.52:1failfailfail
  • AA: use #6d5afc as the text (4.52:1)
  • AAA: use #9587fd as the text (7.16:1)
  • AA: or shift the background to #949494 (4.56:1)
  • AAA: or shift the background to #bababa (7.13:1)

Fixes keep hue and saturation and move lightness only, so the suggestion stays on-brand. Ratios are symmetric: the same numbers apply with #15039b 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

#15039b reads as cool, vivid, technical. The font library is tagged with the same vocabulary:

mcpConnect your agent — build around #15039b
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 #15039b and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link

tool url/palettes/new/15039b-a59cc4-dfaa4e-271f2d-e9ecf1?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