Color
#66cf3f
#66cf3frgb(102, 207, 63)hsl(104, 60%, 53%)oklch(0.763 0.204 138.6)Colors that go with #66cf3f
Blue, Deep Sky Blue and Taupe 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.
Blue #0000ff
shipped4 real palettes, including Minecraft's brand system and MongoDB's brand system put Blue beside #66cf3f, as the accent.
Deep Sky Blue #00bfff
triadicshippedDeep Sky Blue completes a triad with #66cf3f — three hues spaced evenly round the wheel, the classic way to get energy into a palette without a clash.
Taupe #483c32
shippedTaupe is paired with #66cf3f in 9 real palettes, including Minecraft's brand system and WhatsApp's brand system, as the lead colour.
Violet #ee82ee
complementaryViolet sits directly opposite #66cf3f 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-complementshippedHot Pink is a split-complement of #66cf3f: nearly opposite, so it still pops against it, without the vibrating edge of a true complement.
Charcoal #36454f
neutralshippedCharcoal is the body-text near-black for #66cf3f: its slight blue cast keeps type crisp beside a warm colour where pure #000 looks heavy.
Dark Orange #ff8c00
shippedDark Orange shows up next to #66cf3f in 3 real palettes, including Learning App and Citrus Grove, as the accent.
Mustard Yellow #ffdb58
shipped3 real palettes, including Meadow and Citrus Grove put Mustard Yellow beside #66cf3f, as the supporting colour.
Real palettes that use #66cf3f
Tints & shades
Harmonies
Contrast
| #66cf3f as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 1.99:1 | fail | fail | fail | |
Aaon black | 10.56:1 | 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 #66cf3f 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 #66cf3f and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
/palettes/new/66cf3f-a6bea2-724edf-1f2d22-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