Color
#66f41f
#66f41frgb(102, 244, 31)hsl(100, 91%, 54%)oklch(0.855 0.259 138.6)Colors that go with #66f41f
Deep Sky Blue, Violet and Hot Pink 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.
Deep Sky Blue #00bfff
triadicshippedDeep Sky Blue completes a triad with #66f41f — three hues spaced evenly round the wheel, the classic way to get energy into a palette without a clash.
Violet #ee82ee
complementaryViolet sits directly opposite #66f41f 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 #66f41f: 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 #66f41f, as the accent.
Charcoal #36454f
neutralCharcoal is the body-text near-black for #66f41f: its slight blue cast keeps type crisp beside a warm colour where pure #000 looks heavy.
Lilac #c8a2c8
split-complementLilac is a split-complement of #66f41f: nearly opposite, so it still pops against it, without the vibrating edge of a true complement.
Lime Green #32cd32
shippedTwo real palettes: Monster Energy's brand system and Duolingo's brand system put Lime Green beside #66f41f, as the accent.
Red #ff0000
shippedRed is paired with #66f41f in two real palettes: Gatorade's brand system and Wise's brand system, as the supporting colour.
Real palettes that use #66f41f
Tints & shades
Harmonies
Contrast
| #66f41f as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 1.45:1 | fail | fail | fail | |
Aaon black | 14.53:1 | 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 #66f41f 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 #66f41f and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
/palettes/new/66f41f-a8bea2-694edf-1f2d21-f0f1e9?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