Color

#138b2d

#138b2d
hex#138b2d
rgbrgb(19, 139, 45)
hslhsl(133, 76%, 31%)
oklchoklch(0.556 0.165 145.6)
Closest name: Forest Green (#228b22)Relative luminance 0.1879

Colors that go with #138b2d

Charcoal, Royal Blue and Dark Orchid 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 →

#8b1371

#358b13 · #138b69

#2d138b · #8b2d13

Split-complementary

Open in tool →

#69138b · #8b1335

#13358b · #8b1371 · #8b6913

Contrast

#138b2d as textRatioAAAA largeAAAFix
Aaon white
4.41:1failpassfail
  • AA: use #12872c as the text (4.64:1)
  • AAA: use #0e6721 as the text (7.05:1)
  • AA: or shift the background to #080808 (4.54:1)
Aaon black
4.76:1passpassfail
  • AAA: use #18af39 as the text (7.23:1)

Fixes keep hue and saturation and move lightness only, so the suggestion stays on-brand. Ratios are symmetric: the same numbers apply with #138b2d as the background.

Brands using this color

mcpConnect your agent — build around #138b2d
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 #138b2d and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link

tool url/palettes/new/138b2d-a2beab-b84edf-1f2d28-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