Color

#40a5ed

#40a5ed
hex#40a5ed
rgbrgb(64, 165, 237)
hslhsl(205, 83%, 59%)
oklchoklch(0.695 0.14 243.7)
Closest name: Cerulean (#55aaee)Relative luminance 0.3411

Colors that go with #40a5ed

Charcoal, Medium Sea Green and Peru 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 →

#ed8840

#40eddf · #404eed

#ed40a5 · #a5ed40

Split-complementary

Open in tool →

#ed404e · #eddf40

#df40ed · #ed8840 · #4eed40

Contrast

#40a5ed as textRatioAAAA largeAAAFix
Aaon white
2.68:1failfailfail
  • AA: use #127ac4 as the text (4.56:1)
  • AAA: use #0d5a91 as the text (7.27:1)
  • AA: or shift the background to #363636 (4.5:1)
  • AAA: or shift the background to #0f0f0f (7.14:1)
Aaon black
7.82:1passpasspassPasses 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 #40a5ed as the background.

Brands using this color

Fonts for this mood

#40a5ed reads as cool, vivid, technical. The font library is tagged with the same vocabulary:

mcpConnect your agent — build around #40a5ed
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 #40a5ed and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link

tool url/palettes/new/40a5ed-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