Color

#effaf9

#effaf9
hex#effaf9
rgbrgb(239, 250, 249)
hslhsl(175, 52%, 96%)
oklchoklch(0.977 0.012 190.4)
Closest name: Cold White (#edfcfb)Relative luminance 0.9356

Colors that go with #effaf9

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.

Real palettes that use #effaf9

Tints & shades

Every swatch is its own page — click any to analyze it.

Harmonies

Complementary

Open in tool →

#faeff0

#effaf4 · #eff6fa

#f9effa · #faf9ef

Split-complementary

Open in tool →

#faeff6 · #faf4ef

#f4effa · #faeff0 · #f6faef

Contrast

#effaf9 as textRatioAAAA largeAAAFix
Aaon white
1.07:1failfailfail
  • AA: use #288079 as the text (4.71:1)
  • AAA: use #1f615b as the text (7.19:1)
  • AA: or shift the background to #707070 (4.65:1)
  • AAA: or shift the background to #545454 (7.11:1)
Aaon black
19.71:1passpasspassPasses 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 #effaf9 as the background.

Brands using this color

Palettes built around it

Fonts for this mood

#effaf9 reads as light, clean. The font library is tagged with the same vocabulary:

mcpConnect your agent — build around #effaf9
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 #effaf9 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link

tool url/palettes/new/effaf9-a2bdbe-d4599f-1f282d-e9f1ed?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