Color
#66d178
#66d178rgb(102, 209, 120)hsl(130, 54%, 61%)oklch(0.776 0.16 147.4)Colors that go with #66d178
Charcoal, Blue 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.
Charcoal #36454f
neutralshippedCharcoal is the body-text near-black for #66d178: its slight blue cast keeps type crisp beside a warm colour where pure #000 looks heavy.
Blue #0000ff
shipped4 real palettes, including Minecraft's brand system and Unity's brand system put Blue beside #66d178, as the accent.
Deep Sky Blue #00bfff
shippedDesigners have shipped Deep Sky Blue with #66d178: 4 real palettes, including Remix's brand system and Learning App, as the lead colour.
Mustard Yellow #ffdb58
shipped4 real palettes, including Citrus Grove and Fresh Juice put Mustard Yellow beside #66d178, as the accent.
Royal Blue #4169e1
shippedRoyal Blue is paired with #66d178 in 4 real palettes, including Docker's brand system and Brilliant's brand system, as the supporting colour.
Taupe #483c32
shippedTaupe is paired with #66d178 in 16 real palettes, including WhatsApp's brand system and Minecraft's brand system, as the supporting colour.
Violet #ee82ee
complementaryViolet sits directly opposite #66d178 on the wheel — the strongest contrast one hue can give another, so use it small: a button, a link colour, one highlight.
Light Coral #f08080
split-complementshippedLight Coral is a split-complement of #66d178: nearly opposite, so it still pops against it, without the vibrating edge of a true complement.
Real palettes that use #66d178
Tints & shades
Harmonies
Contrast
| #66d178 as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 1.92:1 | fail | fail | fail | |
Aaon black | 10.96:1 | 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 #66d178 as the background.
Brands using this color
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 #66d178 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
/palettes/new/66d178-a2beaa-b14edf-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