Color

blue

#0000ff
hex#0000ff
rgbrgb(0, 0, 255)
hslhsl(240, 100%, 50%)
oklchoklch(0.452 0.313 264.1)
Relative luminance 0.0722

Tints & shades

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

Harmonies

Complementary

Open in tool →

#ffff00

#0080ff · #8000ff

#ff0000 · #00ff00

Split-complementary

Open in tool →

#ff8000 · #80ff00

#ff0080 · #ffff00 · #00ff80

Contrast

blue as textRatioAAAA largeAAAFix
Aaon white
8.59:1passpasspassPasses AAA — no fix needed.
Aaon black
2.44:1failfailfail
  • AA: use #6161ff as the text (4.66:1)
  • AAA: use #8a8aff as the text (7.16:1)
  • AA: or shift the background to #bdbdbd (4.57:1)
  • AAA: or shift the background to #e8e8e8 (7.01:1)

Fixes keep hue and saturation and move lightness only, so the suggestion stays on-brand. Ratios are symmetric: the same numbers apply with blue as the background.

Brands using this color

Fonts for this mood

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

mcpConnect your agent — build around blue
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 #0000ff and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link

tool url/palettes/new/0000ff-a19cc4-df994e-251f2d-e9edf1?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