Color

#1278de

#1278de
hex#1278de
rgbrgb(18, 120, 222)
hslhsl(210, 85%, 47%)
oklchoklch(0.576 0.177 254.3)
Closest name: Royal Blue (#4169e1)Relative luminance 0.1884

Colors that go with #1278de

Charcoal, Crimson and Copper 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 →

#de7812

#12dede · #1212de

#de1278 · #78de12

Split-complementary

Open in tool →

#de1212 · #dede12

#de12de · #de7812 · #12de12

Contrast

#1278de as textRatioAAAA largeAAAFix
Aaon white
4.41:1failpassfail
  • AA: use #1275d9 as the text (4.59:1)
  • AAA: use #0d59a5 as the text (7.02:1)
  • AA: or shift the background to #080808 (4.55:1)
Aaon black
4.77:1passpassfail
  • AAA: use #4299f0 as the text (7.05:1)

Fixes keep hue and saturation and move lightness only, so the suggestion stays on-brand. Ratios are symmetric: the same numbers apply with #1278de as the background.

Brands using this color

Fonts for this mood

#1278de reads as cool, vivid, technical. The font library is tagged with the same vocabulary:

mcpConnect your agent — build around #1278de
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 #1278de and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link

tool url/palettes/new/1278de-9cabc4-df514e-1f202d-e9f1f1?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