Color

#def042

#def042
hex#def042
rgbrgb(222, 240, 66)
hslhsl(66, 85%, 60%)
oklchoklch(0.912 0.187 115.4)
Closest name: Buttercup Glow (#f1f458)Relative luminance 0.7824

Colors that go with #def042

Plum, Charcoal 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 →

#5442f0

#f0aa42 · #88f042

#42def0 · #f042de

Split-complementary

Open in tool →

#4288f0 · #aa42f0

#42f0aa · #5442f0 · #f04288

Contrast

#def042 as textRatioAAAA largeAAAFix
Aaon white
1.26:1failfailfail
  • AA: use #6f7b0a as the text (4.65:1)
  • AAA: use #515a07 as the text (7.46:1)
  • AA: or shift the background to #666666 (4.55:1)
  • AAA: or shift the background to #4a4a4a (7.03:1)
Aaon black
16.65:1passpasspassPasses AAA — no fix needed.

Fixes keep hue and saturation and move lightness only, so the suggestion stays on-brand. Ratios are symmetric: the same numbers apply with #def042 as the background.

Brands using this color

No public brand in the corpus uses this exact color yet. Extract a brand to add one.

mcpConnect your agent — build around #def042
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 #def042 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link

tool url/palettes/new/def042-b8bea2-4e86df-262d1f-f1eee9?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