Color

#540aff

#540aff
hex#540aff
rgbrgb(84, 10, 255)
hslhsl(258, 100%, 52%)
oklchoklch(0.491 0.294 279.5)
Closest name: Blustering Blue (#4411ff)Relative luminance 0.0932

Tints & shades

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

Harmonies

Complementary

Open in tool →

#b6ff0a

#0a3bff · #ce0aff

#ff540a · #0aff54

Split-complementary

Open in tool →

#ffce0a · #3bff0a

#ff0a3b · #b6ff0a · #0affce

Contrast

#540aff as textRatioAAAA largeAAAFix
Aaon white
7.33:1passpasspassPasses AAA — no fix needed.
Aaon black
2.86:1failfailfail
  • AA: use #8652ff as the text (4.66:1)
  • AAA: use #a680ff as the text (7.15:1)
  • AA: or shift the background to #cccccc (4.57:1)
  • AAA: or shift the background to #fafafa (7.02:1)

Fixes keep hue and saturation and move lightness only, so the suggestion stays on-brand. Ratios are symmetric: the same numbers apply with #540aff 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

#540aff reads as cool, vivid, technical. The font library is tagged with the same vocabulary:

mcpConnect your agent — build around #540aff
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 #540aff and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link

tool url/palettes/new/540aff-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