Color

#00398f

#00398f
hex#00398f
rgbrgb(0, 57, 143)
hslhsl(216, 100%, 28%)
oklchoklch(0.373 0.152 260)
Closest name: Deep Space Royal (#223382)Relative luminance 0.0491

Colors that go with #00398f

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 →

#8f5600

#00818f · #0e008f

#8f0039 · #398f00

Split-complementary

Open in tool →

#8f0e00 · #818f00

#8f0081 · #8f5600 · #008f0e

Contrast

#00398f as textRatioAAAA largeAAAFix
Aaon white
10.6:1passpasspassPasses AAA — no fix needed.
Aaon black
1.98:1failfailfail
  • AA: use #0a6cff as the text (4.6:1)
  • AAA: use #5297ff as the text (7.23:1)
  • AA: or shift the background to #ababab (4.61:1)
  • AAA: or shift the background to #d4d4d4 (7.15:1)

Fixes keep hue and saturation and move lightness only, so the suggestion stays on-brand. Ratios are symmetric: the same numbers apply with #00398f as the background.

Brands using this color

Palettes built around it

Fonts for this mood

#00398f reads as cool, vivid, dark. The font library is tagged with the same vocabulary:

mcpConnect your agent — build around #00398f
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 #00398f and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link

tool url/palettes/new/00398f-9ca7c4-df5f4e-201f2d-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