Color

#233b8b

#233b8b
hex#233b8b
rgbrgb(35, 59, 139)
hslhsl(226, 60%, 34%)
oklchoklch(0.384 0.136 267)
Closest name: Deep Space Royal (#223382)Relative luminance 0.0535

Colors that go with #233b8b

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 →

#8b7223

#236f8b · #3e238b

#8b233b · #3b8b23

Split-complementary

Open in tool →

#8b3e23 · #6f8b23

#8b236f · #8b7223 · #238b3e

Contrast

#233b8b as textRatioAAAA largeAAAFix
Aaon white
10.15:1passpasspassPasses AAA — no fix needed.
Aaon black
2.07:1failfailfail
  • AA: use #506ed3 as the text (4.51:1)
  • AAA: use #7c93de as the text (7.09:1)
  • AA: or shift the background to #adadad (4.52:1)
  • AAA: or shift the background to #d9d9d9 (7.19:1)

Fixes keep hue and saturation and move lightness only, so the suggestion stays on-brand. Ratios are symmetric: the same numbers apply with #233b8b as the background.

Brands using this color

Palettes built around it

Fonts for this mood

#233b8b reads as cool, vivid, technical. The font library is tagged with the same vocabulary:

mcpConnect your agent — build around #233b8b
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 #233b8b and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link

tool url/palettes/new/233b8b-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