Color

#21495e

#21495e
hex#21495e
rgbrgb(33, 73, 94)
hslhsl(201, 48%, 25%)
oklchoklch(0.386 0.057 233.9)
Closest name: Raging Thunderstorm (#004f63)Relative luminance 0.059

Colors that go with #21495e

Royal Blue, Teal 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 →

#5e3721

#215e55 · #212a5e

#5e2149 · #495e21

Split-complementary

Open in tool →

#5e212a · #5e5521

#55215e · #5e3721 · #2a5e21

Contrast

#21495e as textRatioAAAA largeAAAFix
Aaon white
9.64:1passpasspassPasses AAA — no fix needed.
Aaon black
2.18:1failfailfail
  • AA: use #387b9f as the text (4.5:1)
  • AAA: use #599fc5 as the text (7.19:1)
  • AA: or shift the background to #b3b3b3 (4.6:1)
  • AAA: or shift the background to #dedede (7.16:1)

Fixes keep hue and saturation and move lightness only, so the suggestion stays on-brand. Ratios are symmetric: the same numbers apply with #21495e as the background.

Brands using this color

Fonts for this mood

#21495e reads as cool, dark, luxury. The font library is tagged with the same vocabulary:

mcpConnect your agent — build around #21495e
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 #21495e and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link

tool url/palettes/new/21495e-9cb1c4-df4e62-1f222d-e9f1f0?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