Laser
Open in tool →Laser green, violet and cyan — the synthwave/gaming set; keep the type near-white and let one neon own each screen.
Color
#21fd3b
#21fd3b
hex
#21fd3brgb
rgb(33, 253, 59)hsl
hsl(127, 98%, 56%)oklch
oklch(0.865 0.276 143.7)Closest name: Electric Laser Lime (#26ff2a)Relative luminance 0.7089
Colors that go with #21fd3b
Violet, Hot Pink 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.
Violet #ee82ee
complementaryViolet sits directly opposite #21fd3b on the wheel — the strongest contrast one hue can give another, so use it small: a button, a link colour, one highlight.
Hot Pink #ff69b4
split-complementHot Pink is a split-complement of #21fd3b: nearly opposite, so it still pops against it, without the vibrating edge of a true complement.
Plum #dda0dd
split-complementPlum is a split-complement of #21fd3b: nearly opposite, so it still pops against it, without the vibrating edge of a true complement.
Charcoal #36454f
neutralCharcoal is the body-text near-black for #21fd3b: its slight blue cast keeps type crisp beside a warm colour where pure #000 looks heavy.
Deep Sky Blue #00bfff
shippedDesigners have shipped Deep Sky Blue with #21fd3b: two real palettes: Remix's brand system and Prime Video's brand system, as the lead colour.
Red #ff0000
shippedRed is paired with #21fd3b in two real palettes: Gatorade's brand system and Wise's brand system, as the supporting colour.
Salmon #fa8072
triadicSalmon completes a triad with #21fd3b — three hues spaced evenly round the wheel, the classic way to get energy into a palette without a clash.
Cornflower Blue #6495ed
triadicCornflower Blue completes a triad with #21fd3b — three hues spaced evenly round the wheel, the classic way to get energy into a palette without a clash.
Real palettes that use #21fd3b
Tints & shades
Harmonies
Contrast
| #21fd3b as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 1.38:1 | fail | fail | fail | |
Aaon black | 15.18:1 | 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 #21fd3b 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
mcpConnect your agent — build around #21fd3b
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 #21fd3b and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
tool url
/palettes/new/21fd3b-a2bea8-aa4edf-1f2d27-ecf1e9?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