brandsweets

Color

#eff31b

#eff31b
hex#eff31b
rgbrgb(239, 243, 27)
hslhsl(61, 90%, 53%)
oklchoklch(0.93 0.201 111)
Closest name: Banana Bandanna (#f8f739)Relative luminance 0.8253
Vivid
Open in palette toolCheck contrast

Tints & shades

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

Harmonies

Complementary

Open in tool →
eff31b1f1bf3

#1f1bf3

Analogous

Open in tool →
eff31bf38b1b84f31b

#f38b1b · #84f31b

Triadic

Open in tool →
eff31b1beff3f31bef

#1beff3 · #f31bef

Split-complementary

Open in tool →
eff31b1b84f38b1bf3

#1b84f3 · #8b1bf3

Tetradic

Open in tool →
eff31b1bf38b1f1bf3f31b84

#1bf38b · #1f1bf3 · #f31b84

Contrast

#eff31b as textRatioAAAA largeAAAFix
Aaon white
1.2:1failfailfail
  • AA: use #777906 as the text (4.64:1)
  • AAA: use #5b5c05 as the text (7.05:1)
  • AA: or shift the background to #696969 (4.58:1)
  • AAA: or shift the background to #4d4d4d (7.05:1)
Aaon black
17.51:1passpasspassPasses 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 #eff31b as the background.

Brands using this color

mcpConnect your agent — build around #eff31b
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 #eff31b and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link

tool url/palettes/new/eff31b-babea2-4e92df-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