Color
#66fa81
#66fa81rgb(102, 250, 129)hsl(131, 94%, 69%)oklch(0.878 0.206 147.1)Colors that go with #66fa81
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 #66fa81 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 #66fa81: 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 #66fa81: 3 real palettes, including Prime Video's brand system and Remix's brand system, as the supporting colour.
Hot Pink #ff69b4
split-complementHot Pink is a split-complement of #66fa81: 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 #66fa81: 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 #66fa81, as the accent.
Crimson #dc143c
shippedCrimson is paired with #66fa81 in two real palettes: Wise's brand system and Formula 1's brand system, as the accent.
Lime Green #32cd32
shippedTwo real palettes: Duolingo's brand system and Monster Energy's brand system put Lime Green beside #66fa81, as the lead colour.
Real palettes that use #66fa81
Tints & shades
Harmonies
Contrast
| #66fa81 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 #66fa81 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 #66fa81 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
/palettes/new/66fa81-a2beaa-b34edf-1f2d28-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