Color

#40acd4

#40acd4
hex#40acd4
rgbrgb(64, 172, 212)
hslhsl(196, 63%, 54%)
oklchoklch(0.7 0.113 226.6)
Closest name: Cousteau (#55a9d6)Relative luminance 0.3535

Colors that go with #40acd4

Charcoal, Amber and 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 →

#d46740

#40d4b1 · #4062d4

#d440ac · #acd440

Split-complementary

Open in tool →

#d44062 · #d4b140

#b140d4 · #d46740 · #62d440

Contrast

#40acd4 as textRatioAAAA largeAAAFix
Aaon white
2.6:1failfailfail
  • AA: use #247d9e as the text (4.66:1)
  • AAA: use #1b6079 as the text (7.01:1)
  • AA: or shift the background to #383838 (4.51:1)
  • AAA: or shift the background to #141414 (7.08:1)
Aaon black
8.07:1passpasspassPasses 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 #40acd4 as the background.

Brands using this color

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

Fonts for this mood

#40acd4 reads as cool, vivid, technical. The font library is tagged with the same vocabulary:

mcpConnect your agent — build around #40acd4
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 #40acd4 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link

tool url/palettes/new/40acd4-9cb5c4-df4e6e-1f232d-e9f1ef?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