Color

#21a656

#21a656
hex#21a656
rgbrgb(33, 166, 86)
hslhsl(144, 67%, 39%)
oklchoklch(0.639 0.161 151.1)
Closest name: Jade (#00a86b)Relative luminance 0.2827

Colors that go with #21a656

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 →

#a62171

#2ea621 · #21a699

#5621a6 · #a65621

Split-complementary

Open in tool →

#9921a6 · #a6212e

#212ea6 · #a62171 · #a69921

Contrast

#21a656 as textRatioAAAA largeAAAFix
Aaon white
3.16:1failpassfail
  • AA: use #1b8847 as the text (4.51:1)
  • AAA: use #146635 as the text (7.04:1)
  • AA: or shift the background to #292929 (4.61:1)
Aaon black
6.65:1passpassfail
  • AAA: use #23af5b as the text (7.35:1)

Fixes keep hue and saturation and move lightness only, so the suggestion stays on-brand. Ratios are symmetric: the same numbers apply with #21a656 as the background.

Brands using this color

Palettes built around it

mcpConnect your agent — build around #21a656
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 #21a656 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link

tool url/palettes/new/21a656-a2beb0-ca59d4-1f2d2b-eaf1e9?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