Color

#4fb3e8

#4fb3e8
hex#4fb3e8
rgbrgb(79, 179, 232)
hslhsl(201, 77%, 61%)
oklchoklch(0.729 0.12 235)
Closest name: Cerulean (#55aaee)Relative luminance 0.3973

Colors that go with #4fb3e8

Charcoal, Dark Orange and Amber 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 →

#e8854f

#4fe8d1 · #4f66e8

#e84fb3 · #b3e84f

Split-complementary

Open in tool →

#e84f66 · #e8d14f

#d14fe8 · #e8854f · #66e84f

Contrast

#4fb3e8 as textRatioAAAA largeAAAFix
Aaon white
2.35:1failfailfail
  • AA: use #177ab0 as the text (4.72:1)
  • AAA: use #125e87 as the text (7.05:1)
  • AA: or shift the background to #3d3d3d (4.63:1)
  • AAA: or shift the background to #1f1f1f (7.02:1)
Aaon black
8.95:1passpasspassPasses 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 #4fb3e8 as the background.

Brands using this color

Fonts for this mood

#4fb3e8 reads as cool, vivid, technical. The font library is tagged with the same vocabulary:

mcpConnect your agent — build around #4fb3e8
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 #4fb3e8 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link

tool url/palettes/new/4fb3e8-9cb1c4-df4e62-1f222d-e9f1f0?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