Color

#5bb2f1

#5bb2f1
hex#5bb2f1
rgbrgb(91, 178, 241)
hslhsl(205, 84%, 65%)
oklchoklch(0.736 0.124 242.5)
Closest name: Cerulean (#55aaee)Relative luminance 0.4042

Colors that go with #5bb2f1

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 →

#f1995b

#5bf1e4 · #5b67f1

#f15bb2 · #b2f15b

Split-complementary

Open in tool →

#f15b67 · #f1e45b

#e45bf1 · #f1995b · #67f15b

Contrast

#5bb2f1 as textRatioAAAA largeAAAFix
Aaon white
2.31:1failfailfail
  • AA: use #117ac5 as the text (4.55:1)
  • AAA: use #0d5a91 as the text (7.27:1)
  • AA: or shift the background to #3d3d3d (4.7:1)
  • AAA: or shift the background to #1f1f1f (7.13:1)
Aaon black
9.08:1passpasspassPasses 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 #5bb2f1 as the background.

Brands using this color

Fonts for this mood

#5bb2f1 reads as cool, vivid, technical. The font library is tagged with the same vocabulary:

mcpConnect your agent — build around #5bb2f1
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 #5bb2f1 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link

tool url/palettes/new/5bb2f1-9cafc4-df4e58-1f212d-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