Color

#101f42

#101f42
hex#101f42
rgbrgb(16, 31, 66)
hslhsl(222, 61%, 16%)
oklchoklch(0.248 0.069 264.5)
Closest name: Dark Eclipse (#112244)Relative luminance 0.0148

Colors that go with #101f42

Charcoal, Dark Olive Green and Sea Green 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 →

#423310

#103842 · #1a1042

#42101f · #1f4210

Split-complementary

Open in tool →

#421a10 · #384210

#421038 · #423310 · #10421a

Contrast

#101f42 as textRatioAAAA largeAAAFix
Aaon white
16.2:1passpasspassPasses AAA — no fix needed.
Aaon black
1.3:1failfailfail
  • AA: use #4670d2 as the text (4.51:1)
  • AAA: use #7896de as the text (7.22:1)
  • AA: or shift the background to #878787 (4.51:1)
  • AAA: or shift the background to #ababab (7.05:1)

Fixes keep hue and saturation and move lightness only, so the suggestion stays on-brand. Ratios are symmetric: the same numbers apply with #101f42 as the background.

Brands using this color

Palettes built around it

Fonts for this mood

#101f42 reads as cool, vivid, dark. The font library is tagged with the same vocabulary:

mcpConnect your agent — build around #101f42
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 #101f42 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link

tool url/palettes/new/101f42-9ca3c4-df6e4e-211f2d-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