brandsweets

Color

#eff551

#eff551
hex#eff551
rgbrgb(239, 245, 81)
hslhsl(62, 89%, 64%)
oklchoklch(0.937 0.179 111.4)
Closest name: Buttercup Glow (#f1f458)Relative luminance 0.8425
Vivid
Open in palette toolCheck contrast

Tints & shades

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

Harmonies

Complementary

Open in tool →
eff5515751f5

#5751f5

Analogous

Open in tool →
eff551f5a9519ef551

#f5a951 · #9ef551

Triadic

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eff55151eff5f551ef

#51eff5 · #f551ef

Split-complementary

Open in tool →
eff551519ef5a951f5

#519ef5 · #a951f5

Tetradic

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eff55151f5a95751f5f5519e

#51f5a9 · #5751f5 · #f5519e

Contrast

#eff551 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 (7.19:1)
Aaon black
17.85:1passpasspassPasses 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 #eff551 as the background.

Brands using this color

mcpConnect your agent — build around #eff551
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 #eff551 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link

tool url/palettes/new/eff551-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