Color

#5b73ec

#5b73ec
hex#5b73ec
rgbrgb(91, 115, 236)
hslhsl(230, 79%, 64%)
oklchoklch(0.601 0.183 271.4)
Closest name: Blue Öyster Cult (#5577ee)Relative luminance 0.2054

Colors that go with #5b73ec

Charcoal, Crimson and Sea Green 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 →

#ecd45b

#5bbbec · #8b5bec

#ec5b73 · #73ec5b

Split-complementary

Open in tool →

#ec8b5b · #bbec5b

#ec5bbb · #ecd45b · #5bec8b

Contrast

#5b73ec as textRatioAAAA largeAAAFix
Aaon white
4.11:1failpassfail
  • AA: use #526beb as the text (4.51:1)
  • AAA: use #1f40e5 as the text (7.18:1)
  • AA: or shift the background to #121212 (4.56:1)
Aaon black
5.11:1passpassfail
  • AAA: use #7f92f0 as the text (7.27:1)

Fixes keep hue and saturation and move lightness only, so the suggestion stays on-brand. Ratios are symmetric: the same numbers apply with #5b73ec 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

#5b73ec reads as cool, vivid, technical. The font library is tagged with the same vocabulary:

mcpConnect your agent — build around #5b73ec
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 #5b73ec and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link

tool url/palettes/new/5b73ec-9c9ec4-df814e-231f2d-e9eef1?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