Playground
Open in tool →Orange, blue and green — the colors of playground equipment; loud, cheerful, obviously for kids.
Color
#39c666
#39c666
hex
#39c666rgb
rgb(57, 198, 102)hsl
hsl(139, 55%, 50%)oklch
oklch(0.731 0.18 149.7)Closest name: Emerald Green (#50c878)Relative luminance 0.4222
Colors that go with #39c666
Charcoal, Blue 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 #39c666: 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 Spotify's brand system put Blue beside #39c666, as the accent.
Royal Blue #4169e1
shippedRoyal Blue is paired with #39c666 in 6 real palettes, including Brilliant's brand system and Docker's brand system, as the accent.
Taupe #483c32
shippedTaupe is paired with #39c666 in 9 real palettes, including Obsidian's brand system and Chime's brand system, as the text colour against it.
Violet #ee82ee
complementaryViolet sits directly opposite #39c666 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 #39c666: nearly opposite, so it still pops against it, without the vibrating edge of a true complement.
Cornflower Blue #6495ed
triadicshippedCornflower Blue completes a triad with #39c666 — three hues spaced evenly round the wheel, the classic way to get energy into a palette without a clash.
Dark Olive Green #556b2f
shippedDark Olive Green shows up next to #39c666 in 3 real palettes, including Undergrowth and 7-Eleven's brand system, as the supporting colour.
Real palettes that use #39c666
Tints & shades
Harmonies
Contrast
| #39c666 as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 2.22:1 | fail | fail | fail | |
Aaon black | 9.44:1 | 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 #39c666 as the background.
Brands using this color
Palettes built around it
mcpConnect your agent — build around #39c666
live endpointPoint 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.
endpoint
https://mcp.brandsweets.com/colors/mcpclaude mcp add --transport http brandsweets-colors https://mcp.brandsweets.com/colors/mcp
try this prompt
›analyze #39c666 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
tool url
/palettes/new/39c666-a2beae-c059d4-1f2d2a-ebf1e9?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