Color

#b1fa29

#b1fa29
hex#b1fa29
rgbrgb(177, 250, 41)
hslhsl(81, 95%, 57%)
oklchoklch(0.903 0.228 128.4)
Closest name: greenyellow (#adff2f)Relative luminance 0.7788

Colors that go with #b1fa29

Violet, Red and 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 →

#7229fa

#fada29 · #48fa29

#29b1fa · #fa29b1

Split-complementary

Open in tool →

#2948fa · #da29fa

#29fada · #7229fa · #fa2948

Contrast

#b1fa29 as textRatioAAAA largeAAAFix
Aaon white
1.27:1failfailfail
  • AA: use #558103 as the text (4.64:1)
  • AAA: use #3e5e02 as the text (7.48:1)
  • AA: or shift the background to #666666 (4.53:1)
  • AAA: or shift the background to #474747 (7.33:1)
Aaon black
16.58:1passpasspassPasses AAA — no fix needed.

Fixes keep hue and saturation and move lightness only, so the suggestion stays on-brand. Ratios are symmetric: the same numbers apply with #b1fa29 as the background.

Brands using this color

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

mcpConnect your agent — build around #b1fa29
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 #b1fa29 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link

tool url/palettes/new/b1fa29-b1bea2-4e62df-222d1f-f1f0e9?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