Color

#31b3bf

#31b3bf
hex#31b3bf
rgbrgb(49, 179, 191)
hslhsl(185, 59%, 47%)
oklchoklch(0.704 0.109 204.3)
Closest name: Aquarius (#2db0ce)Relative luminance 0.3665

Colors that go with #31b3bf

Charcoal, Denim and Dodger Blue 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 →

#bf3d31

#31bf84 · #316cbf

#bf31b3 · #b3bf31

Split-complementary

Open in tool →

#bf316c · #bf8431

#8431bf · #bf3d31 · #6cbf31

Contrast

#31b3bf as textRatioAAAA largeAAAFix
Aaon white
2.52:1failfailfail
  • AA: use #24818a as the text (4.58:1)
  • AAA: use #1a5f65 as the text (7.32:1)
  • AA: or shift the background to #383838 (4.65:1)
  • AAA: or shift the background to #171717 (7.11:1)
Aaon black
8.33:1passpasspassPasses AAA — no fix needed.

Fixes keep hue and saturation and move lightness only, so the suggestion stays on-brand. Ratios are symmetric: the same numbers apply with #31b3bf 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

#31b3bf reads as cool, modern. The font library is tagged with the same vocabulary:

mcpConnect your agent — build around #31b3bf
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 #31b3bf and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link

tool url/palettes/new/31b3bf-a2b8be-df4e88-1f262d-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