Color

#3fa11b

#3fa11b
hex#3fa11b
rgbrgb(63, 161, 27)
hslhsl(104, 71%, 37%)
oklchoklch(0.626 0.187 139.3)
Closest name: Grass Is Greener (#3f9b0b)Relative luminance 0.2663

Colors that go with #3fa11b

Blue, Dodger Blue and Royal 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 →

#7e1ba1

#82a11b · #1ba13b

#1b3fa1 · #a11b3f

Split-complementary

Open in tool →

#3b1ba1 · #a11b82

#1b82a1 · #7e1ba1 · #a13b1b

Contrast

#3fa11b as textRatioAAAA largeAAAFix
Aaon white
3.32:1failpassfail
  • AA: use #358717 as the text (4.54:1)
  • AAA: use #276411 as the text (7.2:1)
  • AA: or shift the background to #262626 (4.56:1)
Aaon black
6.33:1passpassfail
  • AAA: use #44ae1e as the text (7.32:1)

Fixes keep hue and saturation and move lightness only, so the suggestion stays on-brand. Ratios are symmetric: the same numbers apply with #3fa11b 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 #3fa11b
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 #3fa11b and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link

tool url/palettes/new/3fa11b-a6bea2-724edf-1f2d22-eff1e9?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