Color

#f3f5fb

#f3f5fb
hex#f3f5fb
rgbrgb(243, 245, 251)
hslhsl(225, 50%, 97%)
oklchoklch(0.97 0.008 271.3)
Closest name: Cotton Ball (#f2f7fd)Relative luminance 0.9132

Colors that go with #f3f5fb

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 #f3f5fb

Tints & shades

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

Harmonies

Complementary

Open in tool →

#fbf9f4

#f4f9fb · #f5f4fb

#fbf4f5 · #f5fbf4

Split-complementary

Open in tool →

#fbf5f4 · #f9fbf4

#fbf4f9 · #fbf9f4 · #f4fbf5

Contrast

#f3f5fb as textRatioAAAA largeAAAFix
Aaon white
1.09:1failfailfail
  • AA: use #5370c6 as the text (4.67:1)
  • AAA: use #3752a4 as the text (7.23:1)
  • AA: or shift the background to #707070 (4.54:1)
  • AAA: or shift the background to #525252 (7.17:1)
Aaon black
19.26:1passpasspassPasses 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 #f3f5fb as the background.

Brands using this color

Palettes built around it

Fonts for this mood

#f3f5fb reads as cool, light, clean. The font library is tagged with the same vocabulary:

mcpConnect your agent — build around #f3f5fb
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 #f3f5fb and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link

tool url/palettes/new/f3f5fb-9ca1c4-df754e-221f2d-e9eff1?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