Color

#131ffb

#131ffb
hex#131ffb
rgbrgb(19, 31, 251)
hslhsl(237, 97%, 53%)
oklchoklch(0.464 0.298 265.5)
Closest name: Bluebonnet (#1c1cf0)Relative luminance 0.0808

Tints & shades

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

Harmonies

Complementary

Open in tool →

#fbf013

#1393fb · #7c13fb

#fb131f · #1ffb13

Split-complementary

Open in tool →

#fb7c13 · #93fb13

#fb1393 · #fbf013 · #13fb7c

Contrast

#131ffb as textRatioAAAA largeAAAFix
Aaon white
8.03:1passpasspassPasses AAA — no fix needed.
Aaon black
2.62:1failfailfail
  • AA: use #5961fc as the text (4.54:1)
  • AAA: use #868cfd as the text (7.18:1)
  • AA: or shift the background to #c2c2c2 (4.51:1)
  • AAA: or shift the background to #f0f0f0 (7.04:1)

Fixes keep hue and saturation and move lightness only, so the suggestion stays on-brand. Ratios are symmetric: the same numbers apply with #131ffb as the background.

Brands using this color

Fonts for this mood

#131ffb reads as cool, vivid, technical. The font library is tagged with the same vocabulary:

mcpConnect your agent — build around #131ffb
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 #131ffb and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link

tool url/palettes/new/131ffb-9f9cc4-df924e-251f2d-e9edf1?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