Color

#370fff

#370fff
hex#370fff
rgbrgb(55, 15, 255)
hslhsl(250, 100%, 53%)
oklchoklch(0.473 0.3 271.5)
Closest name: Overdue Blue (#4400ff)Relative luminance 0.0837

Tints & shades

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

Harmonies

Complementary

Open in tool →

#d7ff0f

#0f5fff · #af0fff

#ff370f · #0fff37

Split-complementary

Open in tool →

#ffaf0f · #5fff0f

#ff0f5f · #d7ff0f · #0fffaf

Contrast

#370fff as textRatioAAAA largeAAAFix
Aaon white
7.85:1passpasspassPasses AAA — no fix needed.
Aaon black
2.67:1failfailfail
  • AA: use #7357ff as the text (4.54:1)
  • AAA: use #9985ff as the text (7.15:1)
  • AA: or shift the background to #c4c4c4 (4.5:1)
  • AAA: or shift the background to #f2f2f2 (7.01:1)

Fixes keep hue and saturation and move lightness only, so the suggestion stays on-brand. Ratios are symmetric: the same numbers apply with #370fff as the background.

Brands using this color

Fonts for this mood

#370fff reads as cool, vivid, technical. The font library is tagged with the same vocabulary:

mcpConnect your agent — build around #370fff
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 #370fff and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link

tool url/palettes/new/370fff-a79cc4-dfb14e-281f2d-e9ecf1?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