Color

#133d8b

#133d8b
hex#133d8b
rgbrgb(19, 61, 139)
hslhsl(219, 76%, 31%)
oklchoklch(0.382 0.138 261.4)
Closest name: Deep Space Royal (#223382)Relative luminance 0.0534

Colors that go with #133d8b

Charcoal, Crimson 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 →

#8b6113

#13798b · #25138b

#8b133d · #3d8b13

Split-complementary

Open in tool →

#8b2513 · #798b13

#8b1379 · #8b6113 · #138b25

Contrast

#133d8b as textRatioAAAA largeAAAFix
Aaon white
10.15:1passpasspassPasses AAA — no fix needed.
Aaon black
2.07:1failfailfail
  • AA: use #316fe3 as the text (4.51:1)
  • AAA: use #6695ea as the text (7.05:1)
  • 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 #133d8b as the background.

Brands using this color

Palettes built around it

Fonts for this mood

#133d8b reads as cool, vivid, technical. The font library is tagged with the same vocabulary:

mcpConnect your agent — build around #133d8b
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 #133d8b and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link

tool url/palettes/new/133d8b-9ca5c4-df664e-211f2d-e9f0f1?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