Color

#124fbf

#124fbf
hex#124fbf
rgbrgb(18, 79, 191)
hslhsl(219, 83%, 41%)
oklchoklch(0.465 0.186 261.5)
Closest name: Cobalt Blue (#0047ab)Relative luminance 0.0948

Colors that go with #124fbf

Charcoal, Crimson and Steel Blue 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 →

#bf8312

#12a5bf · #2c12bf

#bf124f · #4fbf12

Split-complementary

Open in tool →

#bf2c12 · #a5bf12

#bf12a5 · #bf8312 · #12bf2c

Contrast

#124fbf as textRatioAAAA largeAAAFix
Aaon white
7.25:1passpasspassPasses AAA — no fix needed.
Aaon black
2.9:1failfailfail
  • AA: use #2d70eb as the text (4.63:1)
  • AAA: use #6596f1 as the text (7.19:1)
  • AA: or shift the background to #cccccc (4.51:1)
  • AAA: or shift the background to #fcfcfc (7.07:1)

Fixes keep hue and saturation and move lightness only, so the suggestion stays on-brand. Ratios are symmetric: the same numbers apply with #124fbf as the background.

Brands using this color

Fonts for this mood

#124fbf reads as cool, vivid, technical. The font library is tagged with the same vocabulary:

mcpConnect your agent — build around #124fbf
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 #124fbf and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link

tool url/palettes/new/124fbf-9ca5c4-df664e-211f2d-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