brandsweets

Color

#eff54d

#eff54d
hex#eff54d
rgbrgb(239, 245, 77)
hslhsl(62, 89%, 63%)
oklchoklch(0.937 0.182 111.5)
Closest name: Buttercup Glow (#f1f458)Relative luminance 0.8419
Vivid
Open in palette toolCheck contrast

Tints & shades

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

Harmonies

Complementary

Open in tool →
eff54d524df5

#524df5

Analogous

Open in tool →
eff54df5a64d9bf54d

#f5a64d · #9bf54d

Triadic

Open in tool →
eff54d4deff5f54def

#4deff5 · #f54def

Split-complementary

Open in tool →
eff54d4d9bf5a64df5

#4d9bf5 · #a64df5

Tetradic

Open in tool →
eff54d4df5a6524df5f54d9b

#4df5a6 · #524df5 · #f54d9b

Contrast

#eff54d as textRatioAAAA largeAAAFix
Aaon white
1.18:1failfailfail
  • AA: use #757807 as the text (4.72:1)
  • AAA: use #595c05 as the text (7.1:1)
  • AA: or shift the background to #6b6b6b (4.53:1)
  • AAA: or shift the background to #4d4d4d (7.18:1)
Aaon black
17.84:1passpasspassPasses 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 #eff54d as the background.

Brands using this color

mcpConnect your agent — build around #eff54d
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 #eff54d and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link

tool url/palettes/new/eff54d-babea2-4e8fdf-272d1f-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