#3fc91d as text	Ratio	AA	AA large	AAA	Fix
Aaon white	2.19:1	fail	fail	fail	AA: use #2a8613 as the text (4.65:1) AAA: use #1f620e as the text (7.47:1) AA: or shift the background to #424242 (4.59:1) AAA: or shift the background to #242424 (7.08:1)
Aaon black	9.58:1	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 #3fc91d 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 #3fc91d

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 #3fc91d and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link

tool url/palettes/new/3fc91d-a4bea2-7c4edf-1f2d23-eff1e9?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