brandsweets

Color

#effb41

#effb41
hex#effb41
rgbrgb(239, 251, 65)
hslhsl(64, 96%, 62%)
oklchoklch(0.949 0.194 113.3)
Closest name: Banana Bandanna (#f8f739)Relative luminance 0.8773
Vivid
Open in palette toolCheck contrast

Tints & shades

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

Harmonies

Complementary

Open in tool →
effb414d41fb

#4d41fb

Analogous

Open in tool →
effb41fbab4192fb41

#fbab41 · #92fb41

Triadic

Open in tool →
effb4141effbfb41ef

#41effb · #fb41ef

Split-complementary

Open in tool →
effb414192fbab41fb

#4192fb · #ab41fb

Tetradic

Open in tool →
effb4141fbab4d41fbfb4192

#41fbab · #4d41fb · #fb4192

Contrast

#effb41 as textRatioAAAA largeAAAFix
Aaon white
1.13:1failfailfail
  • AA: use #707802 as the text (4.8:1)
  • AAA: use #545a02 as the text (7.39:1)
  • AA: or shift the background to #6e6e6e (4.5:1)
  • AAA: or shift the background to #4f4f4f (7.23:1)
Aaon black
18.55:1passpasspassPasses 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 #effb41 as the background.

Brands using this color

mcpConnect your agent — build around #effb41
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 #effb41 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link

tool url/palettes/new/effb41-b9bea2-4e8adf-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