brandsweets

Color

#ffff57

#ffff57
hex#ffff57
rgbrgb(255, 255, 87)
hslhsl(60, 100%, 67%)
oklchoklch(0.971 0.182 109.4)
Closest name: Canary (#fdff63)Relative luminance 0.9347
Vivid
Open in palette toolCheck contrast

Tints & shades

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

Harmonies

Complementary

Open in tool →
ffff575757ff

#5757ff

Analogous

Open in tool →
ffff57ffab57abff57

#ffab57 · #abff57

Triadic

Open in tool →
ffff5757ffffff57ff

#57ffff · #ff57ff

Split-complementary

Open in tool →
ffff5757abffab57ff

#57abff · #ab57ff

Tetradic

Open in tool →
ffff5757ffab5757ffff57ab

#57ffab · #5757ff · #ff57ab

Contrast

#ffff57 as textRatioAAAA largeAAAFix
Aaon white
1.07:1failfailfail
  • AA: use #7a7a00 as the text (4.55:1)
  • AAA: use #5c5c00 as the text (7.03:1)
  • AA: or shift the background to #707070 (4.64:1)
  • AAA: or shift the background to #545454 (7.1:1)
Aaon black
19.69:1passpasspassPasses 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 #ffff57 as the background.

Brands using this color

mcpConnect your agent — build around #ffff57
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 #ffff57 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link

tool url/palettes/new/ffff57-bbbea2-4e94df-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