Color

#3fe411

#3fe411
hex#3fe411
rgbrgb(63, 228, 17)
hslhsl(107, 86%, 48%)
oklchoklch(0.803 0.259 140.8)
Closest name: Alarming Slime (#2ce335)Relative luminance 0.5658

Colors that go with #3fe411

Deep Sky Blue, Taupe and Violet 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 →

#b611e4

#a8e411 · #11e44d

#113fe4 · #e4113f

Split-complementary

Open in tool →

#4d11e4 · #e411a8

#11a8e4 · #b611e4 · #e44d11

Contrast

#3fe411 as textRatioAAAA largeAAAFix
Aaon white
1.7:1failfailfail
  • AA: use #25850a as the text (4.73:1)
  • AAA: use #1b6407 as the text (7.31:1)
  • AA: or shift the background to #525252 (4.58:1)
  • AAA: or shift the background to #363636 (7.09:1)
Aaon black
12.32:1passpasspassPasses 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 #3fe411 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 #3fe411
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 #3fe411 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link

tool url/palettes/new/3fe411-a5bea2-7a4edf-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