Color

#315da0

#315da0
hex#315da0
rgbrgb(49, 93, 160)
hslhsl(216, 53%, 41%)
oklchoklch(0.482 0.119 258.6)
Closest name: Blasphemous Blue (#3356aa)Relative luminance 0.1102

Colors that go with #315da0

Charcoal, Sea Green and Amber lead the list. Each partner is a real named colour with the reason it works — a wheel relationship, a neutral that carries it, or a pairing lifted from a palette or brand system that actually shipped — and every pair opens in the palette tool.

Tints & shades

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

Harmonies

Complementary

Open in tool →

#a07431

#3195a0 · #3c31a0

#a0315d · #5da031

Split-complementary

Open in tool →

#a03c31 · #95a031

#a03195 · #a07431 · #31a03c

Contrast

#315da0 as textRatioAAAA largeAAAFix
Aaon white
6.55:1passpassfail
  • AAA: use #2e5794 as the text (7.22:1)
Aaon black
3.2:1failpassfail
  • AA: use #4075c4 as the text (4.56:1)
  • AAA: use #6f97d3 as the text (7.04:1)
  • AA: or shift the background to #d6d6d6 (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 #315da0 as the background.

Brands using this color

Fonts for this mood

#315da0 reads as cool, modern. The font library is tagged with the same vocabulary:

mcpConnect your agent — build around #315da0
live endpoint

Point any MCP client at the shared colors endpoint and your agent gets the same engine as this page — direct_palette, edit_direction, check_palette, check_contrast — read-only, no key. Every direction it proposes comes with a /colors/d/… link: open it, lock what you like, paste the link back, and the agent edits rather than re-rolls.

endpointhttps://mcp.brandsweets.com/colors/mcp
claude mcp add --transport http brandsweets-colors https://mcp.brandsweets.com/colors/mcp
try this prompt

analyze #315da0 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link

tool url/palettes/new/315da0-9ca7c4-df5f4e-201f2d-e9f0f1?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