Color

#3741fb

#3741fb
hex#3741fb
rgbrgb(55, 65, 251)
hslhsl(237, 96%, 60%)
oklchoklch(0.512 0.266 270.1)
Closest name: C64 Blue (#003aff)Relative luminance 0.1156

Tints & shades

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

Harmonies

Complementary

Open in tool →

#fbf137

#37a3fb · #8f37fb

#fb3741 · #41fb37

Split-complementary

Open in tool →

#fb8f37 · #a3fb37

#fb37a3 · #fbf137 · #37fb8f

Contrast

#3741fb as textRatioAAAA largeAAAFix
Aaon white
6.34:1passpassfail
  • AAA: use #2833fb as the text (7.1:1)
Aaon black
3.31:1failpassfail
  • AA: use #5a62fc as the text (4.59:1)
  • AAA: use #878dfd as the text (7.26:1)
  • AA: or shift the background to #dbdbdb (4.58:1)

Fixes keep hue and saturation and move lightness only, so the suggestion stays on-brand. Ratios are symmetric: the same numbers apply with #3741fb 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

#3741fb reads as cool, vivid, technical. The font library is tagged with the same vocabulary:

mcpConnect your agent — build around #3741fb
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 #3741fb and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link

tool url/palettes/new/3741fb-9f9cc4-df924e-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