Color

#156cef

#156cef
hex#156cef
rgbrgb(21, 108, 239)
hslhsl(216, 87%, 51%)
oklchoklch(0.564 0.212 259.8)
Closest name: Bluetiful (#3c69e7)Relative luminance 0.1712

Colors that go with #156cef

Charcoal, Crimson 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 →

#ef9815

#15d9ef · #2b15ef

#ef156c · #6cef15

Split-complementary

Open in tool →

#ef2b15 · #d9ef15

#ef15d9 · #ef9815 · #15ef2b

Contrast

#156cef as textRatioAAAA largeAAAFix
Aaon white
4.75:1passpassfail
  • AAA: use #0d52ba as the text (7.16:1)
Aaon black
4.42:1failpassfail
  • AA: use #1a6fef as the text (4.56:1)
  • AAA: use #5896f3 as the text (7.07:1)
  • AA: or shift the background to #fafafa (4.55:1)

Fixes keep hue and saturation and move lightness only, so the suggestion stays on-brand. Ratios are symmetric: the same numbers apply with #156cef as the background.

Brands using this color

Fonts for this mood

#156cef reads as cool, vivid, technical. The font library is tagged with the same vocabulary:

mcpConnect your agent — build around #156cef
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 #156cef and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link

tool url/palettes/new/156cef-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