Color

#0b5bda

#0b5bda
hex#0b5bda
rgbrgb(11, 91, 218)
hslhsl(217, 90%, 45%)
oklchoklch(0.511 0.207 260.6)
Closest name: Denim (#1560bd)Relative luminance 0.1262

Colors that go with #0b5bda

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 →

#da8b0b

#0bc2da · #240bda

#da0b5b · #5bda0b

Split-complementary

Open in tool →

#da240b · #c2da0b

#da0bc2 · #da8b0b · #0bda24

Contrast

#0b5bda as textRatioAAAA largeAAAFix
Aaon white
5.96:1passpassfail
  • AAA: use #0a51c2 as the text (7.07:1)
Aaon black
3.52:1failpassfail
  • AA: use #1b6ef3 as the text (4.57:1)
  • AAA: use #5a96f6 as the text (7.13:1)
  • AA: or shift the background to #e0e0e0 (4.52:1)

Fixes keep hue and saturation and move lightness only, so the suggestion stays on-brand. Ratios are symmetric: the same numbers apply with #0b5bda as the background.

Brands using this color

Fonts for this mood

#0b5bda reads as cool, vivid, technical. The font library is tagged with the same vocabulary:

mcpConnect your agent — build around #0b5bda
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 #0b5bda and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link

tool url/palettes/new/0b5bda-9ca7c4-df624e-201f2d-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