Color

#21233f

#21233f
hex#21233f
rgbrgb(33, 35, 63)
hslhsl(236, 31%, 19%)
oklchoklch(0.269 0.052 279.2)
Closest name: Black Market (#222244)Relative luminance 0.0188

Colors that go with #21233f

Charcoal, Dark Olive Green and Sienna 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 →

#3f3d21

#21323f · #2e213f

#3f2123 · #233f21

Split-complementary

Open in tool →

#3f2e21 · #323f21

#3f2132 · #3f3d21 · #213f2e

Contrast

#21233f as textRatioAAAA largeAAAFix
Aaon white
15.25:1passpasspassPasses AAA — no fix needed.
Aaon black
1.38:1failfailfail
  • AA: use #6c71b2 as the text (4.64:1)
  • AAA: use #9194c5 as the text (7.25:1)
  • AA: or shift the background to #8c8c8c (4.54:1)
  • AAA: or shift the background to #b0b0b0 (7.03:1)

Fixes keep hue and saturation and move lightness only, so the suggestion stays on-brand. Ratios are symmetric: the same numbers apply with #21233f as the background.

Brands using this color

Palettes built around it

Fonts for this mood

#21233f reads as cool, muted, dark. The font library is tagged with the same vocabulary:

mcpConnect your agent — build around #21233f
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 #21233f and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link

tool url/palettes/new/21233f-9e9cc4-df8f4e-241f2d-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