Color

#3f72fd

#3f72fd
hex#3f72fd
rgbrgb(63, 114, 253)
hslhsl(224, 98%, 62%)
oklchoklch(0.598 0.215 265.1)
Closest name: Blue Öyster Cult (#5577ee)Relative luminance 0.2018

Colors that go with #3f72fd

Charcoal, Crimson and Copper 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 →

#fdca3f

#3fd1fd · #6b3ffd

#fd3f72 · #72fd3f

Split-complementary

Open in tool →

#fd6b3f · #d1fd3f

#fd3fd1 · #fdca3f · #3ffd6b

Contrast

#3f72fd as textRatioAAAA largeAAAFix
Aaon white
4.17:1failpassfail
  • AA: use #356afd as the text (4.53:1)
  • AAA: use #0241ed as the text (7.04:1)
  • AA: or shift the background to #0f0f0f (4.6:1)
Aaon black
5.04:1passpassfail
  • AAA: use #6d93fe as the text (7.25:1)

Fixes keep hue and saturation and move lightness only, so the suggestion stays on-brand. Ratios are symmetric: the same numbers apply with #3f72fd 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

#3f72fd reads as cool, vivid, technical. The font library is tagged with the same vocabulary:

mcpConnect your agent — build around #3f72fd
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 #3f72fd and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link

tool url/palettes/new/3f72fd-9ca2c4-df724e-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