Color

#5751cd

#5751cd
hex#5751cd
rgbrgb(87, 81, 205)
hslhsl(243, 55%, 56%)
oklchoklch(0.513 0.186 279.8)
Closest name: slateblue (#6a5acd)Relative luminance 0.1232

Tints & shades

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

Harmonies

Complementary

Open in tool →

#c6cd51

#5189cd · #9551cd

#cd5751 · #51cd57

Split-complementary

Open in tool →

#cd9551 · #89cd51

#cd5189 · #c6cd51 · #51cd95

Contrast

#5751cd as textRatioAAAA largeAAAFix
Aaon white
6.06:1passpassfail
  • AAA: use #4841c8 as the text (7.33:1)
Aaon black
3.46:1failpassfail
  • AA: use #6e69d3 as the text (4.62:1)
  • AAA: use #9490df as the text (7.31:1)
  • AA: or shift the background to #dedede (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 #5751cd 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

#5751cd reads as cool, modern. The font library is tagged with the same vocabulary:

mcpConnect your agent — build around #5751cd
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 #5751cd and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link

tool url/palettes/new/5751cd-a39cc4-dfa04e-261f2d-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