Color

#12f34a

#12f34a
hex#12f34a
rgbrgb(18, 243, 74)
hslhsl(135, 90%, 51%)
oklchoklch(0.839 0.26 145.2)
Closest name: Becquerel (#4bec13)Relative luminance 0.6472

Colors that go with #12f34a

Violet, Deep Sky Blue and Hot Pink 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 →

#f312ba

#4af312 · #12f3ba

#4a12f3 · #f34a12

Split-complementary

Open in tool →

#ba12f3 · #f3124a

#124af3 · #f312ba · #f3ba12

Contrast

#12f34a as textRatioAAAA largeAAAFix
Aaon white
1.51:1failfailfail
  • AA: use #078827 as the text (4.61:1)
  • AAA: use #05661d as the text (7.18:1)
  • AA: or shift the background to #595959 (4.65:1)
  • AAA: or shift the background to #3d3d3d (7.21:1)
Aaon black
13.94:1passpasspassPasses 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 #12f34a 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 #12f34a
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 #12f34a and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link

tool url/palettes/new/12f34a-a2beac-b759d4-1f2d29-ebf1e9?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