#518551 as text	Ratio	AA	AA large	AAA	Fix
Aaon white	4.35:1	fail	pass	fail	AA: use #4f824f as the text (4.53:1) AAA: use #3a5f3a as the text (7.3:1) AA: or shift the background to #0a0a0a (4.55:1)
Aaon black	4.82:1	pass	pass	fail	AAA: use #6aa46a as the text (7.13:1)

Fixes keep hue and saturation and move lightness only, so the suggestion stays on-brand. Ratios are symmetric: the same numbers apply with #518551 as the background.

Brands using this color

mcpConnect your agent — build around #518551

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 #518551 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link

tool url/palettes/new/518551-a2bea5-994edf-1f2d25-edf1e9?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