#21c058 as text	Ratio	AA	AA large	AAA	Fix
Aaon white	2.4:1	fail	fail	fail	AA: use #17873e as the text (4.59:1) AAA: use #11642e as the text (7.28:1) AA: or shift the background to #3d3d3d (4.52:1) AAA: or shift the background to #1c1c1c (7.1:1)
Aaon black	8.75:1	pass	pass	pass	Passes 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 #21c058 as the background.

Brands using this color

Obsidianaccent · #22c55e · Δ1.44

Palettes built around it

ff8c00 3b82f6 22c55e fff8e7 1d1d1d

Playground

Open in tool →

Orange, blue and green — the colors of playground equipment; loud, cheerful, obviously for kids.

Bold Playful WarmKids

mcpConnect your agent — build around #21c058

live endpoint

Point any MCP client at the shared colors endpoint and your agent gets the same engine as this page — generate_palette, check_contrast, analyze_color — read-only, no key. Every palette it proposes comes with a /palettes/new/… link: open it, lock what you like, paste the link back.

endpointhttps://mcp.brandsweets.com/colors/mcp

claude mcp add --transport http brandsweets-colors https://mcp.brandsweets.com/colors/mcp

try this prompt

›analyze #21c058 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link

tool url/palettes/new/21c058-a2beaf-c459d4-1f2d2a-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