Color

#1237f3

#1237f3
hex#1237f3
rgbrgb(18, 55, 243)
hslhsl(230, 90%, 51%)
oklchoklch(0.478 0.273 265.2)
Closest name: C64 Blue (#003aff)Relative luminance 0.0933

Tints & shades

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

Harmonies

Complementary

Open in tool →

#f3cd12

#12a8f3 · #5d12f3

#f31237 · #37f312

Split-complementary

Open in tool →

#f35d12 · #a8f312

#f312a8 · #f3cd12 · #12f35d

Contrast

#1237f3 as textRatioAAAA largeAAAFix
Aaon white
7.33:1passpasspassPasses AAA — no fix needed.
Aaon black
2.87:1failfailfail
  • AA: use #4c68f6 as the text (4.62:1)
  • AAA: use #7c91f8 as the text (7.26:1)
  • AA: or shift the background to #cccccc (4.56:1)
  • AAA: or shift the background to #fafafa (7.02:1)

Fixes keep hue and saturation and move lightness only, so the suggestion stays on-brand. Ratios are symmetric: the same numbers apply with #1237f3 as the background.

Brands using this color

No public brand in the corpus uses this exact color yet. Extract a brand to add one.

Fonts for this mood

#1237f3 reads as cool, vivid, technical. The font library is tagged with the same vocabulary:

mcpConnect your agent — build around #1237f3
live endpoint

Point any MCP client at the shared colors endpoint and your agent gets the same engine as this page — generate_palette, check_contrast, analyze_color — read-only, no key. Every palette it proposes comes with a /palettes/new/… link: open it, lock what you like, paste the link back.

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

analyze #1237f3 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link

tool url/palettes/new/1237f3-9c9ec4-df814e-231f2d-e9eef1?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