Color

#0a4e57

#0a4e57
hex#0a4e57
rgbrgb(10, 78, 87)
hslhsl(187, 79%, 19%)
oklchoklch(0.39 0.063 208.9)
Closest name: Raging Thunderstorm (#004f63)Relative luminance 0.062

Tints & shades

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

Harmonies

Complementary

Open in tool →

#57130a

#0a5739 · #0a2857

#570a4e · #4e570a

Split-complementary

Open in tool →

#570a28 · #57390a

#390a57 · #57130a · #28570a

Contrast

#0a4e57 as textRatioAAAA largeAAAFix
Aaon white
9.37:1passpasspassPasses AAA — no fix needed.
Aaon black
2.24:1failfailfail
  • AA: use #118392 as the text (4.69:1)
  • AAA: use #15a4b7 as the text (7.03:1)
  • AA: or shift the background to #b5b5b5 (4.57:1)
  • AAA: or shift the background to #e0e0e0 (7.1:1)

Fixes keep hue and saturation and move lightness only, so the suggestion stays on-brand. Ratios are symmetric: the same numbers apply with #0a4e57 as the background.

Brands using this color

Fonts for this mood

#0a4e57 reads as cool, vivid, dark. The font library is tagged with the same vocabulary:

mcpConnect your agent — build around #0a4e57
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 #0a4e57 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link

tool url/palettes/new/0a4e57-a2b8be-df4e83-1f262d-e9f1ee?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