#66ca02 as text	Ratio	AA	AA large	AAA	Fix
Aaon white	2.1:1	fail	fail	fail	AA: use #428301 as the text (4.69:1) AAA: use #306001 as the text (7.5:1) AA: or shift the background to #454545 (4.57:1) AAA: or shift the background to #262626 (7.22:1)
Aaon black	10.01:1	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 #66ca02 as the background.

Brands using this color

Palettes built around it

58cc02 1cb0f6 ff9600 ffffff 1c1c1c

Learning App

Open in tool →

Green, blue and orange at full saturation: the gamified-learning look, where every color is a reward.

Playful Vivid FriendlyEducation

mcpConnect your agent — build around #66ca02

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 #66ca02 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link

tool url/palettes/new/66ca02-adbea2-514edf-202d1f-f1f1e9?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