Color
#66bf63
#66bf63rgb(102, 191, 99)hsl(118, 42%, 57%)oklch(0.727 0.154 143.2)Colors that go with #66bf63
Charcoal, Dark Olive Green and Royal 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 #66bf63: its slight blue cast keeps type crisp beside a warm colour where pure #000 looks heavy.
Dark Olive Green #556b2f
shippedDark Olive Green shows up next to #66bf63 in 4 real palettes, including Undergrowth and Forest Floor, as the supporting colour.
Royal Blue #4169e1
shippedRoyal Blue is paired with #66bf63 in 5 real palettes, including Brilliant's brand system and Docker's brand system, as the accent.
Taupe #483c32
shippedTaupe is paired with #66bf63 in 15 real palettes, including Meadow and Minecraft's brand system, as the text colour against it.
Orchid #da70d6
complementaryOrchid sits directly opposite #66bf63 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 Minecraft's brand system and Unity's brand system put Blue beside #66bf63, as the accent.
Cornflower Blue #6495ed
triadicshippedCornflower Blue completes a triad with #66bf63 — three hues spaced evenly round the wheel, the classic way to get energy into a palette without a clash.
Dark Orange #ff8c00
shippedDark Orange shows up next to #66bf63 in 3 real palettes, including Playground and Citrus Grove, as the lead colour.
Real palettes that use #66bf63
Tints & shades
Harmonies
Contrast
| #66bf63 as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 2.28:1 | fail | fail | fail | |
Aaon black | 9.2:1 | 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 #66bf63 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 #66bf63 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
/palettes/new/66bf63-a2bea4-944edf-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