Color

#129dde

#129dde
hex#129dde
rgbrgb(18, 157, 222)
hslhsl(199, 85%, 47%)
oklchoklch(0.661 0.142 237.6)
Closest name: Blue Burst (#309cd0)Relative luminance 0.2952

Colors that go with #129dde

Charcoal, Orange Red 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 →

#de5212

#12deb8 · #1237de

#de129d · #9dde12

Split-complementary

Open in tool →

#de1237 · #deb812

#b812de · #de5212 · #37de12

Contrast

#129dde as textRatioAAAA largeAAAFix
Aaon white
3.04:1failpassfail
  • AA: use #0e7caf as the text (4.65:1)
  • AAA: use #0b5e84 as the text (7.12:1)
  • AA: or shift the background to #2b2b2b (4.65:1)
Aaon black
6.9:1passpassfail
  • AAA: use #12a1e2 as the text (7.22:1)

Fixes keep hue and saturation and move lightness only, so the suggestion stays on-brand. Ratios are symmetric: the same numbers apply with #129dde as the background.

Brands using this color

Fonts for this mood

#129dde reads as cool, vivid, technical. The font library is tagged with the same vocabulary:

mcpConnect your agent — build around #129dde
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 #129dde and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link

tool url/palettes/new/129dde-9cb3c4-df4e66-1f232d-e9f1f0?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