Color

#f3fc40

#f3fc40
hex#f3fc40
rgbrgb(243, 252, 64)
hslhsl(63, 97%, 62%)
oklchoklch(0.954 0.195 112.4)
Closest name: Banana Bandanna (#f8f739)Relative luminance 0.8905

Colors that go with #f3fc40

Taupe, Violet and Plum lead the list. Each partner is a real named colour with the reason it works — a wheel relationship, a neutral that carries it, or a pairing lifted from a palette or brand system that actually shipped — and every pair opens in the palette tool.

Tints & shades

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

Harmonies

Complementary

Open in tool →

#4a40fc

#fca740 · #95fc40

#40f3fc · #fc40f3

Split-complementary

Open in tool →

#4095fc · #a740fc

#40fca7 · #4a40fc · #fc4095

Contrast

#f3fc40 as textRatioAAAA largeAAAFix
Aaon white
1.12:1failfailfail
  • AA: use #737902 as the text (4.7:1)
  • AAA: use #565a01 as the text (7.35:1)
  • AA: or shift the background to #6e6e6e (4.57:1)
  • AAA: or shift the background to #4f4f4f (7.34:1)
Aaon black
18.81:1passpasspassPasses 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 #f3fc40 as the background.

Brands using this color

mcpConnect your agent — build around #f3fc40
live endpoint

Point any MCP client at the shared colors endpoint and your agent gets the same engine as this page — direct_palette, edit_direction, check_palette, check_contrast — read-only, no key. Every direction it proposes comes with a /colors/d/… link: open it, lock what you like, paste the link back, and the agent edits rather than re-rolls.

endpointhttps://mcp.brandsweets.com/colors/mcp
claude mcp add --transport http brandsweets-colors https://mcp.brandsweets.com/colors/mcp
try this prompt

analyze #f3fc40 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link

tool url/palettes/new/f3fc40-b9bea2-4e8ddf-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