Crayon Box
Open in tool →Red, teal and yellow at crayon saturation — joyful, but on white with black type so it stays readable for grown-ups.
Color
#fbef51
#fbef51
hex
#fbef51rgb
rgb(251, 239, 81)hsl
hsl(56, 96%, 65%)oklch
oklch(0.935 0.172 105)Closest name: Buttercup Glow (#f1f458)Relative luminance 0.8284
Colors that go with #fbef51
Lilac, Blue and Charcoal 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.
Lilac #c8a2c8
complementaryshippedLilac sits directly opposite #fbef51 on the wheel — the strongest contrast one hue can give another, so use it small: a button, a link colour, one highlight.
Blue #0000ff
shipped4 real palettes, including Snapchat's brand system and Bumble's brand system put Blue beside #fbef51, as the supporting colour.
Charcoal #36454f
neutralshippedCharcoal is the body-text near-black for #fbef51: its slight blue cast keeps type crisp beside a warm colour where pure #000 looks heavy.
Crimson #dc143c
shippedCrimson is paired with #fbef51 in 8 real palettes, including Ferrari's brand system and Lay's's brand system, as the lead colour.
Deep Sky Blue #00bfff
split-complementshippedDeep Sky Blue is a split-complement of #fbef51: nearly opposite, so it still pops against it, without the vibrating edge of a true complement.
Denim #1560bd
shippedDesigners have shipped Denim with #fbef51: 6 real palettes, including FIFA's brand system and Ikea's brand system, as the supporting colour.
Red #ff0000
shippedRed is paired with #fbef51 in 4 real palettes, including Heineken's brand system and Paddle's brand system, as the accent.
Taupe #483c32
shippedTaupe is paired with #fbef51 in 11 real palettes, including Crayon Box and Calvin Klein's brand system, as the text colour against it.
Real palettes that use #fbef51
Tints & shades
Harmonies
Contrast
| #fbef51 as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 1.2:1 | fail | fail | fail | |
Aaon black | 17.57:1 | pass | pass | pass | Passes 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 #fbef51 as the background.
Brands using this color
No public brand in the corpus uses this exact color yet. Extract a brand to add one.
Palettes built around it
Fonts for this mood
#fbef51 reads as warm, vivid, playful. The font library is tagged with the same vocabulary:
mcpConnect your agent — build around #fbef51
live endpointPoint 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.
endpoint
https://mcp.brandsweets.com/colors/mcpclaude mcp add --transport http brandsweets-colors https://mcp.brandsweets.com/colors/mcp
try this prompt
›analyze #fbef51 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
tool url
/palettes/new/fbef51-bdbea2-4e9edf-282d1f-f1ede9?lock=0&style=vibrantWant the agent to remember your picks and write them into a living brand? Create a free BrandSweets workspace.
Machine-readable: color.md