brandsweets

Color

#ffff42

#ffff42
hex#ffff42
rgbrgb(255, 255, 66)
hslhsl(60, 100%, 63%)
oklchoklch(0.97 0.194 109.5)
Closest name: Big Yellow Taxi (#ffff33)Relative luminance 0.9317
Vivid
Open in palette toolCheck contrast

Tints & shades

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

Harmonies

Complementary

Open in tool →
ffff424242ff

#4242ff

Analogous

Open in tool →
ffff42ffa142a1ff42

#ffa142 · #a1ff42

Triadic

Open in tool →
ffff4242ffffff42ff

#42ffff · #ff42ff

Split-complementary

Open in tool →
ffff4242a1ffa142ff

#42a1ff · #a142ff

Tetradic

Open in tool →
ffff4242ffa14242ffff42a1

#42ffa1 · #4242ff · #ff42a1

Contrast

#ffff42 as textRatioAAAA largeAAAFix
Aaon white
1.07:1failfailfail
  • AA: use #7a7a00 as the text (4.55:1)
  • AAA: use #5c5c00 as the text (7.03:1)
  • AA: or shift the background to #707070 (4.63:1)
  • AAA: or shift the background to #545454 (7.08:1)
Aaon black
19.63:1passpasspassPasses 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 #ffff42 as the background.

Brands using this color

mcpConnect your agent — build around #ffff42
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 #ffff42 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link

tool url/palettes/new/ffff42-bbbea2-4e94df-272d1f-f1ede9?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