Color

#213b97

#213b97
hex#213b97
rgbrgb(33, 59, 151)
hslhsl(227, 64%, 36%)
oklchoklch(0.394 0.154 266.9)
Closest name: Depths of Night (#2c319b)Relative luminance 0.0569

Colors that go with #213b97

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 →

#977d21

#217597 · #422197

#97213b · #3b9721

Split-complementary

Open in tool →

#974221 · #759721

#972175 · #977d21 · #219742

Contrast

#213b97 as textRatioAAAA largeAAAFix
Aaon white
9.83:1passpasspassPasses AAA — no fix needed.
Aaon black
2.14:1failfailfail
  • AA: use #4f6dd8 as the text (4.51:1)
  • AAA: use #7d93e3 as the text (7.15:1)
  • AA: or shift the background to #b0b0b0 (4.53:1)
  • AAA: or shift the background to #dbdbdb (7.1:1)

Fixes keep hue and saturation and move lightness only, so the suggestion stays on-brand. Ratios are symmetric: the same numbers apply with #213b97 as the background.

Brands using this color

Palettes built around it

Fonts for this mood

#213b97 reads as cool, vivid, technical. The font library is tagged with the same vocabulary:

mcpConnect your agent — build around #213b97
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 #213b97 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link

tool url/palettes/new/213b97-9ca0c4-df7a4e-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