Color

#2145ba

#2145ba
hex#2145ba
rgbrgb(33, 69, 186)
hslhsl(226, 70%, 43%)
oklchoklch(0.445 0.189 265.6)
Closest name: Cobalt Blue (#0047ab)Relative luminance 0.0812

Colors that go with #2145ba

Charcoal, Sea Green and Steel 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 →

#ba9721

#2191ba · #4a21ba

#ba2145 · #45ba21

Split-complementary

Open in tool →

#ba4a21 · #91ba21

#ba2191 · #ba9721 · #21ba4a

Contrast

#2145ba as textRatioAAAA largeAAAFix
Aaon white
8:1passpasspassPasses AAA — no fix needed.
Aaon black
2.62:1failfailfail
  • AA: use #4d6fe0 as the text (4.67:1)
  • AAA: use #7992e7 as the text (7.08:1)
  • AA: or shift the background to #c4c4c4 (4.59:1)
  • AAA: or shift the background to #f0f0f0 (7.02:1)

Fixes keep hue and saturation and move lightness only, so the suggestion stays on-brand. Ratios are symmetric: the same numbers apply with #2145ba as the background.

Brands using this color

Fonts for this mood

#2145ba reads as cool, vivid, technical. The font library is tagged with the same vocabulary:

mcpConnect your agent — build around #2145ba
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 #2145ba and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link

tool url/palettes/new/2145ba-9ca1c4-df774e-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