Color

#0558ff

#0558ff
hex#0558ff
rgbrgb(5, 88, 255)
hslhsl(220, 100%, 51%)
oklchoklch(0.539 0.256 262.6)
Closest name: Blue Ribbon (#0066ff)Relative luminance 0.1423

Colors that go with #0558ff

Charcoal, Crimson 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 →

#ffac05

#05d5ff · #2f05ff

#ff0558 · #58ff05

Split-complementary

Open in tool →

#ff2f05 · #d5ff05

#ff05d5 · #ffac05 · #05ff2f

Contrast

#0558ff as textRatioAAAA largeAAAFix
Aaon white
5.46:1passpassfail
  • AAA: use #0049db as the text (7.06:1)
Aaon black
3.85:1failpassfail
  • AA: use #1f69ff as the text (4.52:1)
  • AAA: use #5c92ff as the text (7.01:1)
  • AA: or shift the background to #ebebeb (4.58:1)

Fixes keep hue and saturation and move lightness only, so the suggestion stays on-brand. Ratios are symmetric: the same numbers apply with #0558ff as the background.

Brands using this color

Fonts for this mood

#0558ff reads as cool, vivid, technical. The font library is tagged with the same vocabulary:

mcpConnect your agent — build around #0558ff
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 #0558ff and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link

tool url/palettes/new/0558ff-9ca5c4-df694e-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