Color

#00aaff

#00aaff
hex#00aaff
rgbrgb(0, 170, 255)
hslhsl(200, 100%, 50%)
oklchoklch(0.707 0.168 242)
Closest name: Cerulean (#55aaee)Relative luminance 0.3597

Tints & shades

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

Harmonies

Complementary

Open in tool →

#ff5500

#00ffd5 · #002aff

#ff00aa · #aaff00

Split-complementary

Open in tool →

#ff002b · #ffd500

#d400ff · #ff5500 · #2bff00

Contrast

#00aaff as textRatioAAAA largeAAAFix
Aaon white
2.56:1failfailfail
  • AA: use #007ab8 as the text (4.69:1)
  • AAA: use #005c8a as the text (7.25:1)
  • AA: or shift the background to #383838 (4.58:1)
  • AAA: or shift the background to #141414 (7.19:1)
Aaon black
8.19:1passpasspassPasses 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 #00aaff as the background.

Brands using this color

Fonts for this mood

#00aaff reads as cool, vivid, technical. The font library is tagged with the same vocabulary:

mcpConnect your agent — build around #00aaff
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 #00aaff and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link

tool url/palettes/new/00aaff-9cb2c4-df4e64-1f232d-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