Color

#243a94

#243a94
hex#243a94
rgbrgb(36, 58, 148)
hslhsl(228, 61%, 36%)
oklchoklch(0.391 0.15 268.1)
Closest name: Depths of Night (#2c319b)Relative luminance 0.0554

Colors that go with #243a94

Charcoal, Steel Blue and 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 →

#947d24

#247294 · #452494

#94243a · #3a9424

Split-complementary

Open in tool →

#944524 · #729424

#942472 · #947d24 · #249445

Contrast

#243a94 as textRatioAAAA largeAAAFix
Aaon white
9.96:1passpasspassPasses AAA — no fix needed.
Aaon black
2.11:1failfailfail
  • AA: use #536dd5 as the text (4.52:1)
  • AAA: use #8093e0 as the text (7.17:1)
  • AA: or shift the background to #b0b0b0 (4.59:1)
  • AAA: or shift the background to #d9d9d9 (7.06:1)

Fixes keep hue and saturation and move lightness only, so the suggestion stays on-brand. Ratios are symmetric: the same numbers apply with #243a94 as the background.

Brands using this color

Palettes built around it

Fonts for this mood

#243a94 reads as cool, vivid, technical. The font library is tagged with the same vocabulary:

mcpConnect your agent — build around #243a94
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 #243a94 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link

tool url/palettes/new/243a94-9c9fc4-df7c4e-231f2d-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