Color

#3fbdd9

#3fbdd9
hex#3fbdd9
rgbrgb(63, 189, 217)
hslhsl(191, 67%, 55%)
oklchoklch(0.742 0.114 215.8)
Closest name: Blue Martini (#52b4d3)Relative luminance 0.4246

Colors that go with #3fbdd9

Charcoal, Dark Orange and Denim 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 →

#d95c3f

#3fd9a8 · #3f70d9

#d93fbd · #bdd93f

Split-complementary

Open in tool →

#d93f70 · #d9a83f

#a83fd9 · #d95c3f · #70d93f

Contrast

#3fbdd9 as textRatioAAAA largeAAAFix
Aaon white
2.21:1failfailfail
  • AA: use #1d7f95 as the text (4.64:1)
  • AAA: use #165e6f as the text (7.33:1)
  • AA: or shift the background to #424242 (4.54:1)
  • AAA: or shift the background to #242424 (7.02:1)
Aaon black
9.49:1passpasspassPasses 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 #3fbdd9 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

#3fbdd9 reads as cool, vivid, technical. The font library is tagged with the same vocabulary:

mcpConnect your agent — build around #3fbdd9
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 #3fbdd9 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link

tool url/palettes/new/3fbdd9-a2b6be-df4e7a-1f252d-e9f1ef?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