Color

#42adff

#42adff
hex#42adff
rgbrgb(66, 173, 255)
hslhsl(206, 100%, 63%)
oklchoklch(0.723 0.154 245.6)
Closest name: Cerulean (#55aaee)Relative luminance 0.3827

Tints & shades

Every swatch is its own page — click any to analyze it.

Harmonies

Complementary

Open in tool →

#ff9442

#42fff2 · #424fff

#ff42ad · #adff42

Split-complementary

Open in tool →

#ff424f · #fff242

#f242ff · #ff9442 · #4fff42

Contrast

#42adff as textRatioAAAA largeAAAFix
Aaon white
2.43:1failfailfail
  • AA: use #0076d1 as the text (4.65:1)
  • AAA: use #005a9e as the text (7.1:1)
  • AA: or shift the background to #3b3b3b (4.62:1)
  • AAA: or shift the background to #1c1c1c (7.02:1)
Aaon black
8.65:1passpasspassPasses 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 #42adff as the background.

Brands using this color

Fonts for this mood

#42adff reads as cool, vivid, technical. The font library is tagged with the same vocabulary:

mcpConnect your agent — build around #42adff
live endpoint

Point any MCP client at the shared colors endpoint and your agent gets the same engine as this page — generate_palette, check_contrast, analyze_color — read-only, no key. Every palette it proposes comes with a /palettes/new/… link: open it, lock what you like, paste the link back.

endpointhttps://mcp.brandsweets.com/colors/mcp
claude mcp add --transport http brandsweets-colors https://mcp.brandsweets.com/colors/mcp
try this prompt

analyze #42adff and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link

tool url/palettes/new/42adff-9caec4-df4e56-1f212d-e9f1f1?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