Arcade
Open in tool →Hot pink, cyan and acid yellow on near-black — cabinet-glow neon; the black surface is what makes the colours light up.
Named color
Bat-Signal
#feff00
hex
#feff00rgb
rgb(254, 255, 0)hsl
hsl(60, 100%, 50%)oklch
oklch(0.967 0.211 110.1)Relative luminance 0.9259
Bat Signal on this page is the real value, not a screenshot: exact hex, RGB, HSL and OKLCH, ten tints and ten shades, classic harmonies, and WCAG contrast with fixes — plus the 4 public brands that use it and the palettes it appears in.
Colors that go with Bat-Signal
Lilac, Blue and Taupe 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 Bat-Signal 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 Robinhood's brand system put Blue beside Bat-Signal, as the supporting colour.
Taupe #483c32
shippedTaupe is paired with Bat-Signal in 4 real palettes, including Calvin Klein's brand system and Tommy Hilfiger's brand system, as the lead colour.
Violet #ee82ee
split-complementshippedViolet is a split-complement of Bat-Signal: nearly opposite, so it still pops against it, without the vibrating edge of a true complement.
Deep Sky Blue #00bfff
split-complementshippedDeep Sky Blue is a split-complement of Bat-Signal: nearly opposite, so it still pops against it, without the vibrating edge of a true complement.
Charcoal #36454f
neutralshippedCharcoal is the body-text near-black for Bat-Signal: its slight blue cast keeps type crisp beside a warm colour where pure #000 looks heavy.
Crimson #dc143c
shippedCrimson is paired with Bat-Signal in 3 real palettes, including Ferrari's brand system and Lay's's brand system, as the lead colour.
Deep Pink #ff1493
shipped3 real palettes, including Arcade and JetBrains's brand system put Deep Pink beside Bat-Signal, as the lead colour.
Real palettes that use Bat-Signal
Tints & shades
Harmonies
Contrast
| Bat-Signal as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 1.08:1 | fail | fail | fail | |
Aaon black | 19.52:1 | 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 Bat-Signal as the background.
Brands using this color
Palettes built around it
mcpConnect your agent — build around Bat-Signal
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 #feff00 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
tool url
/palettes/new/feff00-bbbea2-4e94df-272d1f-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