Color
#66fc40
#66fc40rgb(102, 252, 64)hsl(108, 97%, 62%)oklch(0.876 0.255 140.2)Colors that go with #66fc40
Violet, Charcoal and Deep Sky Blue 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 #66fc40 on the wheel — the strongest contrast one hue can give another, so use it small: a button, a link colour, one highlight.
Charcoal #36454f
neutralshippedCharcoal is the body-text near-black for #66fc40: its slight blue cast keeps type crisp beside a warm colour where pure #000 looks heavy.
Deep Sky Blue #00bfff
triadicshippedDeep Sky Blue completes a triad with #66fc40 — three hues spaced evenly round the wheel, the classic way to get energy into a palette without a clash.
Hot Pink #ff69b4
split-complementHot Pink is a split-complement of #66fc40: 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 #66fc40, as the accent.
Lilac #c8a2c8
split-complementLilac is a split-complement of #66fc40: nearly opposite, so it still pops against it, without the vibrating edge of a true complement.
Lime Green #32cd32
shippedTwo real palettes: Duolingo's brand system and Monster Energy's brand system put Lime Green beside #66fc40, as the lead colour.
Red #ff0000
shippedRed is paired with #66fc40 in two real palettes: Wise's brand system and Gatorade's brand system, as the lead colour.
Real palettes that use #66fc40
Tints & shades
Harmonies
Contrast
| #66fc40 as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 1.35:1 | fail | fail | fail | |
Aaon black | 15.56:1 | 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 #66fc40 as the background.
Brands using this color
No public brand in the corpus uses this exact color yet. Extract a brand to add one.
Point 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.
https://mcp.brandsweets.com/colors/mcpclaude mcp add --transport http brandsweets-colors https://mcp.brandsweets.com/colors/mcp
›analyze #66fc40 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
/palettes/new/66fc40-a4bea2-7c4edf-1f2d23-eff1e9?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