Color

#40b9bf

#40b9bf
hex#40b9bf
rgbrgb(64, 185, 191)
hslhsl(183, 50%, 50%)
oklchoklch(0.722 0.105 199.8)
Closest name: Blue Bobbin (#52b4ca)Relative luminance 0.3955

Colors that go with #40b9bf

Charcoal, Denim and Dodger 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 →

#bf4640

#40bf86 · #4079bf

#bf40b9 · #b9bf40

Split-complementary

Open in tool →

#bf4079 · #bf8640

#8640bf · #bf4640 · #79bf40

Contrast

#40b9bf as textRatioAAAA largeAAAFix
Aaon white
2.36:1failfailfail
  • AA: use #2d8186 as the text (4.57:1)
  • AAA: use #216063 as the text (7.2:1)
  • AA: or shift the background to #3d3d3d (4.61:1)
  • AAA: or shift the background to #1c1c1c (7.23:1)
Aaon black
8.91:1passpasspassPasses 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 #40b9bf 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

#40b9bf reads as cool, modern. The font library is tagged with the same vocabulary:

mcpConnect your agent — build around #40b9bf
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 #40b9bf and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link

tool url/palettes/new/40b9bf-a2b9be-d4598e-1f262d-e9f1ee?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