Color

#2a51bb

#2a51bb
hex#2a51bb
rgbrgb(42, 81, 187)
hslhsl(224, 63%, 45%)
oklchoklch(0.473 0.173 265)
Closest name: Blasphemous Blue (#3356aa)Relative luminance 0.0996

Tints & shades

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

Harmonies

Complementary

Open in tool →

#bb942a

#2a99bb · #4c2abb

#bb2a51 · #51bb2a

Split-complementary

Open in tool →

#bb4c2a · #99bb2a

#bb2a99 · #bb942a · #2abb4c

Contrast

#2a51bb as textRatioAAAA largeAAAFix
Aaon white
7.02:1passpasspassPasses AAA — no fix needed.
Aaon black
2.99:1failfailfail
  • AA: use #4c71d6 as the text (4.64:1)
  • AAA: use #7a95e1 as the text (7.21:1)
  • AA: or shift the background to #cfcfcf (4.5:1)
  • AAA: or shift the background to #ffffff (7.02:1)

Fixes keep hue and saturation and move lightness only, so the suggestion stays on-brand. Ratios are symmetric: the same numbers apply with #2a51bb as the background.

Brands using this color

No public brand in the corpus uses this exact color yet. Extract a brand to add one.

Fonts for this mood

#2a51bb reads as cool, vivid, technical. The font library is tagged with the same vocabulary:

mcpConnect your agent — build around #2a51bb
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 #2a51bb and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link

tool url/palettes/new/2a51bb-9ca2c4-df724e-221f2d-e9eff1?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