Color

#313545

#313545
hex#313545
rgbrgb(49, 53, 69)
hslhsl(228, 17%, 23%)
oklchoklch(0.332 0.029 273.8)
Closest name: After Midnight (#38393f)Relative luminance 0.0363

Colors that go with #313545

Amber, Blue and Blush Pink 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 →

#454131

#313f45 · #373145

#453135 · #354531

Split-complementary

Open in tool →

#453731 · #3f4531

#45313f · #454131 · #314537

Contrast

#313545 as textRatioAAAA largeAAAFix
Aaon white
12.17:1passpasspassPasses AAA — no fix needed.
Aaon black
1.73:1failfailfail
  • AA: use #6d7597 as the text (4.64:1)
  • AAA: use #8e94af as the text (7.01:1)
  • AA: or shift the background to #9e9e9e (4.54:1)
  • AAA: or shift the background to #c7c7c7 (7.2:1)

Fixes keep hue and saturation and move lightness only, so the suggestion stays on-brand. Ratios are symmetric: the same numbers apply with #313545 as the background.

Brands using this color

Palettes built around it

Fonts for this mood

#313545 reads as cool, muted, dark. The font library is tagged with the same vocabulary:

mcpConnect your agent — build around #313545
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 #313545 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link

tool url/palettes/new/313545-9c9fc4-df7c4e-231f2d-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