Color

#40d4bb

#40d4bb
hex#40d4bb
rgbrgb(64, 212, 187)
hslhsl(170, 63%, 54%)
oklchoklch(0.787 0.128 179)
Closest name: mediumturquoise (#48d1cc)Relative luminance 0.5176

Colors that go with #40d4bb

Charcoal, Crimson and Deep Sky 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 →

#d44058

#40d471 · #40a2d4

#bb40d4 · #d4bb40

Split-complementary

Open in tool →

#d440a2 · #d47140

#7140d4 · #d44058 · #a2d440

Contrast

#40d4bb as textRatioAAAA largeAAAFix
Aaon white
1.85:1failfailfail
  • AA: use #1e8574 as the text (4.5:1)
  • AAA: use #176457 as the text (7.01:1)
  • AA: or shift the background to #4d4d4d (4.57:1)
  • AAA: or shift the background to #303030 (7.14:1)
Aaon black
11.35:1passpasspassPasses 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 #40d4bb 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 #40d4bb
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 #40d4bb and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link

tool url/palettes/new/40d4bb-a2bebd-d459a9-1f292d-e9f1ec?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