Color

#135df1

#135df1
hex#135df1
rgbrgb(19, 93, 241)
hslhsl(220, 89%, 51%)
oklchoklch(0.536 0.232 262.3)
Closest name: Blue Ribbon (#0066ff)Relative luminance 0.1432

Colors that go with #135df1

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 →

#f1a713

#13ccf1 · #3813f1

#f1135d · #5df113

Split-complementary

Open in tool →

#f13813 · #ccf113

#f113cc · #f1a713 · #13f138

Contrast

#135df1 as textRatioAAAA largeAAAFix
Aaon white
5.44:1passpassfail
  • AAA: use #0c4dcf as the text (7.05:1)
Aaon black
3.86:1failpassfail
  • AA: use #2b6ef3 as the text (4.63:1)
  • AAA: use #6595f6 as the text (7.18:1)
  • AA: or shift the background to #ebebeb (4.56:1)

Fixes keep hue and saturation and move lightness only, so the suggestion stays on-brand. Ratios are symmetric: the same numbers apply with #135df1 as the background.

Brands using this color

Palettes built around it

Fonts for this mood

#135df1 reads as cool, vivid, technical. The font library is tagged with the same vocabulary:

mcpConnect your agent — build around #135df1
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 #135df1 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link

tool url/palettes/new/135df1-9ca5c4-df694e-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