Color

#0f428f

#0f428f
hex#0f428f
rgbrgb(15, 66, 143)
hslhsl(216, 81%, 31%)
oklchoklch(0.396 0.138 259.3)
Closest name: Cascade Twilight (#234893)Relative luminance 0.0598

Colors that go with #0f428f

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.

Real palettes that use #0f428f

Tints & shades

Every swatch is its own page — click any to analyze it.

Harmonies

Complementary

Open in tool →

#8f5c0f

#0f828f · #1c0f8f

#8f0f42 · #428f0f

Split-complementary

Open in tool →

#8f1c0f · #828f0f

#8f0f82 · #8f5c0f · #0f8f1c

Contrast

#0f428f as textRatioAAAA largeAAAFix
Aaon white
9.56:1passpasspassPasses AAA — no fix needed.
Aaon black
2.2:1failfailfail
  • AA: use #2171e8 as the text (4.59:1)
  • AAA: use #5d97ee as the text (7.13:1)
  • AA: or shift the background to #b3b3b3 (4.56:1)
  • AAA: or shift the background to #dedede (7.11:1)

Fixes keep hue and saturation and move lightness only, so the suggestion stays on-brand. Ratios are symmetric: the same numbers apply with #0f428f as the background.

Brands using this color

Palettes built around it

Fonts for this mood

#0f428f reads as cool, vivid, technical. The font library is tagged with the same vocabulary:

mcpConnect your agent — build around #0f428f
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 #0f428f and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link

tool url/palettes/new/0f428f-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