brandsweets

Color

#f3ff4d

#f3ff4d
hex#f3ff4d
rgbrgb(243, 255, 77)
hslhsl(64, 100%, 65%)
oklchoklch(0.961 0.191 113.3)
Closest name: Biohazard Suit (#fbfb4c)Relative luminance 0.9111
Vivid
Open in palette toolCheck contrast

Tints & shades

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

Harmonies

Complementary

Open in tool →
f3ff4d584dff

#584dff

Analogous

Open in tool →
f3ff4dffb24d9aff4d

#ffb24d · #9aff4d

Triadic

Open in tool →
f3ff4d4df3ffff4df3

#4df3ff · #ff4df3

Split-complementary

Open in tool →
f3ff4d4d9affb24dff

#4d9aff · #b24dff

Tetradic

Open in tool →
f3ff4d4dffb2584dffff4d9a

#4dffb2 · #584dff · #ff4d9a

Contrast

#f3ff4d as textRatioAAAA largeAAAFix
Aaon white
1.09:1failfailfail
  • AA: use #727a00 as the text (4.67:1)
  • AAA: use #565c00 as the text (7.18:1)
  • AA: or shift the background to #707070 (4.53:1)
  • AAA: or shift the background to #525252 (7.15:1)
Aaon black
19.22:1passpasspassPasses 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 #f3ff4d as the background.

Brands using this color

mcpConnect your agent — build around #f3ff4d
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 #f3ff4d and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link

tool url/palettes/new/f3ff4d-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