Color

#21a147

#21a147
hex#21a147
rgbrgb(33, 161, 71)
hslhsl(138, 66%, 38%)
oklchoklch(0.623 0.168 148.1)
Closest name: Green Revolution (#009944)Relative luminance 0.2627

Colors that go with #21a147

Charcoal, Blue and Crimson 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 →

#a1217a

#3ba121 · #21a187

#4721a1 · #a14721

Split-complementary

Open in tool →

#8721a1 · #a1213b

#213ba1 · #a1217a · #a18721

Contrast

#21a147 as textRatioAAAA largeAAAFix
Aaon white
3.36:1failpassfail
  • AA: use #1c873c as the text (4.58:1)
  • AAA: use #15662d as the text (7.07:1)
  • AA: or shift the background to #262626 (4.51:1)
Aaon black
6.25:1passpassfail
  • AAA: use #24ae4d as the text (7.24:1)

Fixes keep hue and saturation and move lightness only, so the suggestion stays on-brand. Ratios are symmetric: the same numbers apply with #21a147 as the background.

Brands using this color

Palettes built around it

mcpConnect your agent — build around #21a147
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 #21a147 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link

tool url/palettes/new/21a147-a2beae-be59d4-1f2d29-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