Color

#5757cb

#5757cb
hex#5757cb
rgbrgb(87, 87, 203)
hslhsl(240, 53%, 57%)
oklchoklch(0.522 0.175 278.4)
Closest name: slateblue (#6a5acd)Relative luminance 0.1315

Tints & shades

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

Harmonies

Complementary

Open in tool →

#cbcb57

#5791cb · #9157cb

#cb5757 · #57cb57

Split-complementary

Open in tool →

#cb9157 · #91cb57

#cb5791 · #cbcb57 · #57cb91

Contrast

#5757cb as textRatioAAAA largeAAAFix
Aaon white
5.78:1passpassfail
  • AAA: use #4444c5 as the text (7.29:1)
Aaon black
3.63:1failpassfail
  • AA: use #6b6bd1 as the text (4.65:1)
  • AAA: use #8e8edc as the text (7.05:1)
  • AA: or shift the background to #e3e3e3 (4.51:1)

Fixes keep hue and saturation and move lightness only, so the suggestion stays on-brand. Ratios are symmetric: the same numbers apply with #5757cb 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

#5757cb reads as cool, modern. The font library is tagged with the same vocabulary:

mcpConnect your agent — build around #5757cb
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 #5757cb and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link

tool url/palettes/new/5757cb-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