Color

#f5dc51

#f5dc51
hex#f5dc51
rgbrgb(245, 220, 81)
hslhsl(51, 89%, 64%)
oklchoklch(0.891 0.156 98.9)
Closest name: Mustard Yellow (#ffdb58)Relative luminance 0.7119

Colors that go with #f5dc51

Charcoal, Deep Sky Blue and Lilac 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 →

#516af5

#f58b51 · #bcf551

#51f5dc · #dc51f5

Split-complementary

Open in tool →

#51bcf5 · #8b51f5

#51f58b · #516af5 · #f551bc

Contrast

#f5dc51 as textRatioAAAA largeAAAFix
Aaon white
1.38:1failfailfail
  • AA: use #877408 as the text (4.63:1)
  • AAA: use #655706 as the text (7.19:1)
  • AA: or shift the background to #5e5e5e (4.71:1)
  • AAA: or shift the background to #424242 (7.29:1)
Aaon black
15.24:1passpasspassPasses 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 #f5dc51 as the background.

Brands using this color

Fonts for this mood

#f5dc51 reads as warm, vivid, playful. The font library is tagged with the same vocabulary:

mcpConnect your agent — build around #f5dc51
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 #f5dc51 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link

tool url/palettes/new/f5dc51-c4c29c-4eaadf-292d1f-f1ece9?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