Color

#172121

#172121
hex#172121
rgbrgb(23, 33, 33)
hslhsl(180, 18%, 11%)
oklchoklch(0.238 0.014 196.2)
Closest name: Underworld (#1e231c)Relative luminance 0.0138

Tints & shades

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

Harmonies

Complementary

Open in tool →

#211717

#17211c · #171c21

#211721 · #212117

Split-complementary

Open in tool →

#21171c · #211c17

#1c1721 · #211717 · #1c2117

Contrast

#172121 as textRatioAAAA largeAAAFix
Aaon white
16.46:1passpasspassPasses AAA — no fix needed.
Aaon black
1.28:1failfailfail
  • AA: use #567b7b as the text (4.51:1)
  • AAA: use #729d9d as the text (7.03:1)
  • AA: or shift the background to #878787 (4.58:1)
  • AAA: or shift the background to #ababab (7.17:1)

Fixes keep hue and saturation and move lightness only, so the suggestion stays on-brand. Ratios are symmetric: the same numbers apply with #172121 as the background.

Brands using this color

Palettes built around it

Fonts for this mood

#172121 reads as cool, muted, dark. The font library is tagged with the same vocabulary:

mcpConnect your agent — build around #172121
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 #172121 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link

tool url/palettes/new/172121-a2bbbe-d45994-1f272d-e9f1ed?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