Color
#66d166
#66d166rgb(102, 209, 102)hsl(120, 54%, 61%)oklch(0.773 0.176 143.6)Colors that go with #66d166
Charcoal, Royal 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.
Charcoal #36454f
neutralshippedCharcoal is the body-text near-black for #66d166: its slight blue cast keeps type crisp beside a warm colour where pure #000 looks heavy.
Royal Blue #4169e1
shippedRoyal Blue is paired with #66d166 in 5 real palettes, including Brilliant's brand system and Monster Energy's brand system, as the accent.
Taupe #483c32
shippedTaupe is paired with #66d166 in 8 real palettes, including WhatsApp's brand system and Citrus Grove, as the supporting colour.
Violet #ee82ee
complementaryViolet sits directly opposite #66d166 on the wheel — the strongest contrast one hue can give another, so use it small: a button, a link colour, one highlight.
Blue #0000ff
shipped3 real palettes, including MongoDB's brand system and Unity's brand system put Blue beside #66d166, as the accent.
Dark Olive Green #556b2f
shippedDark Olive Green shows up next to #66d166 in 3 real palettes, including 7-Eleven's brand system and Undergrowth, as the supporting colour.
Dark Orange #ff8c00
shippedDark Orange shows up next to #66d166 in 3 real palettes, including Citrus Grove and Playground, as the lead colour.
Deep Sky Blue #00bfff
shippedDesigners have shipped Deep Sky Blue with #66d166: 3 real palettes, including Learning App and Remix's brand system, as the supporting colour.
Real palettes that use #66d166
Tints & shades
Harmonies
Contrast
| #66d166 as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 1.93:1 | fail | fail | fail | |
Aaon black | 10.88:1 | 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 #66d166 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 #66d166 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
/palettes/new/66d166-a2bea5-994edf-1f2d25-edf1e9?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