brandsweets

Color

#eff221

#eff221
hex#eff221
rgbrgb(239, 242, 33)
hslhsl(61, 89%, 54%)
oklchoklch(0.928 0.198 110.6)
Closest name: Banana Bandanna (#f8f739)Relative luminance 0.8196
Vivid
Open in palette toolCheck contrast

Tints & shades

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

Harmonies

Complementary

Open in tool →
eff2212521f2

#2521f2

Analogous

Open in tool →
eff221f28d2186f221

#f28d21 · #86f221

Triadic

Open in tool →
eff22121eff2f221ef

#21eff2 · #f221ef

Split-complementary

Open in tool →
eff2212186f28d21f2

#2186f2 · #8d21f2

Tetradic

Open in tool →
eff22121f28d2521f2f22186

#21f28d · #2521f2 · #f22186

Contrast

#eff221 as textRatioAAAA largeAAAFix
Aaon white
1.21:1failfailfail
  • AA: use #777807 as the text (4.69:1)
  • AAA: use #5a5c05 as the text (7.08:1)
  • AA: or shift the background to #696969 (4.55:1)
  • AAA: or shift the background to #4d4d4d (7:1)
Aaon black
17.39:1passpasspassPasses 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 #eff221 as the background.

Brands using this color

mcpConnect your agent — build around #eff221
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 #eff221 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link

tool url/palettes/new/eff221-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