Color

#318c4e

#318c4e
hex#318c4e
rgbrgb(49, 140, 78)
hslhsl(139, 48%, 37%)
oklchoklch(0.57 0.128 150.6)
Closest name: seagreen (#2e8b57)Relative luminance 0.1996

Colors that go with #318c4e

Charcoal, Royal Blue and Copper 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 →

#8c316f

#428c31 · #318c7b

#4e318c · #8c4e31

Split-complementary

Open in tool →

#7b318c · #8c3142

#31428c · #8c316f · #8c7b31

Contrast

#318c4e as textRatioAAAA largeAAAFix
Aaon white
4.21:1failpassfail
  • AA: use #2e844a as the text (4.65:1)
  • AAA: use #226237 as the text (7.32:1)
  • AA: or shift the background to #0f0f0f (4.56:1)
Aaon black
4.99:1passpassfail
  • AAA: use #3caa5f as the text (7.11:1)

Fixes keep hue and saturation and move lightness only, so the suggestion stays on-brand. Ratios are symmetric: the same numbers apply with #318c4e as the background.

Brands using this color

mcpConnect your agent — build around #318c4e
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 #318c4e and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link

tool url/palettes/new/318c4e-a2beae-c059d4-1f2d2a-ebf1e9?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