Color

#5878da

#5878da
hex#5878da
rgbrgb(88, 120, 218)
hslhsl(225, 64%, 60%)
oklchoklch(0.597 0.154 267.9)
Closest name: Blue Öyster Cult (#5577ee)Relative luminance 0.2057

Colors that go with #5878da

Charcoal, Sea Green and Amber 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 →

#daba58

#58bada · #7858da

#da5878 · #78da58

Split-complementary

Open in tool →

#da7858 · #bada58

#da58ba · #daba58 · #58da78

Contrast

#5878da as textRatioAAAA largeAAAFix
Aaon white
4.11:1failpassfail
  • AA: use #4b6ed8 as the text (4.64:1)
  • AAA: use #294ebc as the text (7.22:1)
  • AA: or shift the background to #121212 (4.56:1)
Aaon black
5.11:1passpassfail
  • AAA: use #7993e2 as the text (7.08:1)

Fixes keep hue and saturation and move lightness only, so the suggestion stays on-brand. Ratios are symmetric: the same numbers apply with #5878da as the background.

Brands using this color

Fonts for this mood

#5878da reads as cool, vivid, technical. The font library is tagged with the same vocabulary:

mcpConnect your agent — build around #5878da
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 #5878da and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link

tool url/palettes/new/5878da-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