Color

#81d378

#81d378
hex#81d378
rgbrgb(129, 211, 120)
hslhsl(114, 51%, 65%)
oklchoklch(0.793 0.148 141.9)
Closest name: Fluorescence (#89d178)Relative luminance 0.5261

Colors that go with #81d378

Plum, Blue and Charcoal 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 →

#ca78d3

#afd378 · #78d39d

#7881d3 · #d37881

Split-complementary

Open in tool →

#9d78d3 · #d378af

#78afd3 · #ca78d3 · #d39d78

Contrast

#81d378 as textRatioAAAA largeAAAFix
Aaon white
1.82:1failfailfail
  • AA: use #35872c as the text (4.51:1)
  • AAA: use #276420 as the text (7.17:1)
  • AA: or shift the background to #4d4d4d (4.64:1)
  • AAA: or shift the background to #303030 (7.24:1)
Aaon black
11.52:1passpasspassPasses 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 #81d378 as the background.

Brands using this color

No public brand in the corpus uses this exact color yet. Extract a brand to add one.

mcpConnect your agent — build around #81d378
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 #81d378 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link

tool url/palettes/new/81d378-a2bea2-8a4edf-1f2d24-eef1e9?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