Color
#66a451
#66a451rgb(102, 164, 81)hsl(105, 34%, 48%)oklch(0.657 0.132 138.3)Colors that go with #66a451
Charcoal, Blue and Crimson 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 #66a451: its slight blue cast keeps type crisp beside a warm colour where pure #000 looks heavy.
Blue #0000ff
shipped6 real palettes, including Spotify's brand system and Unity's brand system put Blue beside #66a451, as the accent.
Crimson #dc143c
shippedCrimson is paired with #66a451 in 4 real palettes, including DuckDuckGo's brand system and Diner, as the supporting colour.
Denim #1560bd
shippedDesigners have shipped Denim with #66a451: 5 real palettes, including Peacock and Intel's brand system, as the supporting colour.
Midnight Blue #191970
shipped4 real palettes, including Telehealth and Fintech Trust put Midnight Blue beside #66a451, as the text colour against it.
Royal Blue #4169e1
shippedRoyal Blue is paired with #66a451 in 5 real palettes, including Console Light and Telehealth, as the lead colour.
Taupe #483c32
shippedTaupe is paired with #66a451 in 19 real palettes, including Undergrowth and Meadow, as the surface under it.
Medium Orchid #ba55d3
complementaryMedium Orchid sits directly opposite #66a451 on the wheel — the strongest contrast one hue can give another, so use it small: a button, a link colour, one highlight.
Real palettes that use #66a451
Tints & shades
Harmonies
Contrast
| #66a451 as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 3:1 | fail | pass | fail | |
Aaon black | 6.99:1 | pass | pass | fail |
|
Fixes keep hue and saturation and move lightness only, so the suggestion stays on-brand. Ratios are symmetric: the same numbers apply with #66a451 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 #66a451 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
/palettes/new/66a451-a6bea2-754edf-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