Color

#0b2def

#0b2def
hex#0b2def
rgbrgb(11, 45, 239)
hslhsl(231, 91%, 49%)
oklchoklch(0.461 0.278 264.9)
Closest name: Bluebonnet (#1c1cf0)Relative luminance 0.0818

Colors that go with #0b2def

Charcoal, Crimson and Cobalt Blue 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 →

#efcd0b

#0b9fef · #5b0bef

#ef0b2d · #2def0b

Split-complementary

Open in tool →

#ef5b0b · #9fef0b

#ef0b9f · #efcd0b · #0bef5b

Contrast

#0b2def as textRatioAAAA largeAAAFix
Aaon white
7.97:1passpasspassPasses AAA — no fix needed.
Aaon black
2.64:1failfailfail
  • AA: use #4b65f7 as the text (4.5:1)
  • AAA: use #7b8ef9 as the text (7.08:1)
  • AA: or shift the background to #c4c4c4 (4.57:1)
  • AAA: or shift the background to #f2f2f2 (7.12:1)

Fixes keep hue and saturation and move lightness only, so the suggestion stays on-brand. Ratios are symmetric: the same numbers apply with #0b2def 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

#0b2def reads as cool, vivid, technical. The font library is tagged with the same vocabulary:

mcpConnect your agent — build around #0b2def
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 #0b2def and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link

tool url/palettes/new/0b2def-9c9ec4-df834e-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