Color

#40c980

#40c980
hex#40c980
rgbrgb(64, 201, 128)
hslhsl(148, 56%, 52%)
oklchoklch(0.745 0.158 155.6)
Closest name: Emerald Green (#50c878)Relative luminance 0.4442

Colors that go with #40c980

Charcoal, Blue and Cornflower 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.

Tints & shades

Every swatch is its own page — click any to analyze it.

Harmonies

Complementary

Open in tool →

#c94089

#45c940 · #40c9c5

#8040c9 · #c98040

Split-complementary

Open in tool →

#c540c9 · #c94045

#4045c9 · #c94089 · #c9c540

Contrast

#40c980 as textRatioAAAA largeAAAFix
Aaon white
2.12:1failfailfail
  • AA: use #258351 as the text (4.73:1)
  • AAA: use #1c633d as the text (7.24:1)
  • AA: or shift the background to #454545 (4.51:1)
  • AAA: or shift the background to #262626 (7.12:1)
Aaon black
9.88:1passpasspassPasses 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 #40c980 as the background.

Brands using this color

mcpConnect your agent — build around #40c980
live endpoint

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.

endpointhttps://mcp.brandsweets.com/colors/mcp
claude mcp add --transport http brandsweets-colors https://mcp.brandsweets.com/colors/mcp
try this prompt

analyze #40c980 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link

tool url/palettes/new/40c980-a2beb2-d259d4-1f2d2c-eaf1e9?lock=0&style=vibrant

Want the agent to remember your picks and write them into a living brand? Create a free BrandSweets workspace.

Machine-readable: color.md