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
#42ff42
#42ff42
hex
#42ff42rgb
rgb(66, 255, 66)hsl
hsl(120, 100%, 63%)oklch
oklch(0.875 0.268 142.8)Closest name: Cathode Green (#00ff55)Relative luminance 0.7307
Colors that go with #42ff42
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 #42ff42 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 #42ff42: 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 #42ff42: nearly opposite, so it still pops against it, without the vibrating edge of a true complement.
Blue #0000ff
shippedTwo real palettes: MongoDB's brand system and Robinhood's brand system put Blue beside #42ff42, as the accent.
Charcoal #36454f
neutralCharcoal is the body-text near-black for #42ff42: 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 #42ff42: two real palettes: Remix's brand system and Prime Video's brand system, as the lead colour.
Lime Green #32cd32
shippedTwo real palettes: Duolingo's brand system and Monster Energy's brand system put Lime Green beside #42ff42, as the lead colour.
Red #ff0000
shippedRed is paired with #42ff42 in two real palettes: Gatorade's brand system and Wise's brand system, as the supporting colour.
Real palettes that use #42ff42
Tints & shades
Harmonies
Contrast
| #42ff42 as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 1.34:1 | fail | fail | fail | |
Aaon black | 15.61:1 | 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 #42ff42 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 #42ff42
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 #42ff42 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
tool url
/palettes/new/42ff42-a2bea5-994edf-1f2d25-edf1e9?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