Color

#870317

#870317
hex#870317
rgbrgb(135, 3, 23)
hslhsl(351, 96%, 27%)
oklchoklch(0.395 0.157 23.6)
Closest name: Bloodthirsty (#880011)Relative luminance 0.0528

Tints & shades

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

Harmonies

Complementary

Open in tool →

#038773

#870359 · #873103

#178703 · #031787

Split-complementary

Open in tool →

#038731 · #035987

#598703 · #038773 · #310387

Contrast

#870317 as textRatioAAAA largeAAAFix
Aaon white
10.22:1passpasspassPasses AAA — no fix needed.
Aaon black
2.06:1failfailfail
  • AA: use #eb0527 as the text (4.58:1)
  • AAA: use #fc5f77 as the text (7.04:1)
  • AA: or shift the background to #adadad (4.55:1)
  • AAA: or shift the background to #d6d6d6 (7.03:1)

Fixes keep hue and saturation and move lightness only, so the suggestion stays on-brand. Ratios are symmetric: the same numbers apply with #870317 as the background.

Brands using this color

No public brand in the corpus uses this exact color yet. Extract a brand to add one.

Fonts for this mood

#870317 reads as warm, vivid, dark. The font library is tagged with the same vocabulary:

mcpConnect your agent — build around #870317
live endpoint

Point any MCP client at the shared colors endpoint and your agent gets the same engine as this page — generate_palette, check_contrast, analyze_color — read-only, no key. Every palette it proposes comes with a /palettes/new/… link: open it, lock what you like, paste the link back.

endpointhttps://mcp.brandsweets.com/colors/mcp
claude mcp add --transport http brandsweets-colors https://mcp.brandsweets.com/colors/mcp
try this prompt

analyze #870317 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link

tool url/palettes/new/870317-c49c9e-62cb89-2d231f-f1e9ee?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