Color

#3b79ed

#3b79ed
hex#3b79ed
rgbrgb(59, 121, 237)
hslhsl(219, 83%, 58%)
oklchoklch(0.598 0.187 261.5)
Closest name: Blue Öyster Cult (#5577ee)Relative luminance 0.2072

Colors that go with #3b79ed

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 →

#edaf3b

#3bd2ed · #563bed

#ed3b79 · #79ed3b

Split-complementary

Open in tool →

#ed563b · #d2ed3b

#ed3bd2 · #edaf3b · #3bed56

Contrast

#3b79ed as textRatioAAAA largeAAAFix
Aaon white
4.08:1failpassfail
  • AA: use #2d70eb as the text (4.54:1)
  • AAA: use #1250c4 as the text (7.07:1)
  • AA: or shift the background to #141414 (4.51:1)
Aaon black
5.14:1passpassfail
  • AAA: use #6596f1 as the text (7.19:1)

Fixes keep hue and saturation and move lightness only, so the suggestion stays on-brand. Ratios are symmetric: the same numbers apply with #3b79ed 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

#3b79ed reads as cool, vivid, technical. The font library is tagged with the same vocabulary:

mcpConnect your agent — build around #3b79ed
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 #3b79ed and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link

tool url/palettes/new/3b79ed-9ca5c4-df664e-211f2d-e9f0f1?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