Color

#5401ef

#5401ef
hex#5401ef
rgbrgb(84, 1, 239)
hslhsl(261, 99%, 47%)
oklchoklch(0.47 0.281 281.5)
Closest name: Overdue Blue (#4400ff)Relative luminance 0.0814

Colors that go with #5401ef

Charcoal, Cobalt Blue and Crimson lead the list. Each partner is a real named colour with the reason it works — a wheel relationship, a neutral that carries it, or a pairing lifted from a palette or brand system that actually shipped — and every pair opens in the palette tool.

Tints & shades

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

Harmonies

Complementary

Open in tool →

#9bef01

#0125ef · #cb01ef

#ef5401 · #01ef54

Split-complementary

Open in tool →

#efcb01 · #25ef01

#ef0125 · #9bef01 · #01efcb

Contrast

#5401ef as textRatioAAAA largeAAAFix
Aaon white
7.99:1passpasspassPasses AAA — no fix needed.
Aaon black
2.63:1failfailfail
  • AA: use #8b4dfe as the text (4.59:1)
  • AAA: use #ac80fe as the text (7.27:1)
  • AA: or shift the background to #c4c4c4 (4.58:1)
  • AAA: or shift the background to #f0f0f0 (7.01:1)

Fixes keep hue and saturation and move lightness only, so the suggestion stays on-brand. Ratios are symmetric: the same numbers apply with #5401ef 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

#5401ef reads as cool, vivid, technical. The font library is tagged with the same vocabulary:

mcpConnect your agent — build around #5401ef
live endpoint

Point any MCP client at the shared colors endpoint and your agent gets the same engine as this page — direct_palette, edit_direction, check_palette, check_contrast — read-only, no key. Every direction it proposes comes with a /colors/d/… link: open it, lock what you like, paste the link back, and the agent edits rather than re-rolls.

endpointhttps://mcp.brandsweets.com/colors/mcp
claude mcp add --transport http brandsweets-colors https://mcp.brandsweets.com/colors/mcp
try this prompt

analyze #5401ef and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link

tool url/palettes/new/5401ef-af9cc4-dfcb4e-2a1f2d-e9eaf1?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