#3fcf91 as text	Ratio	AA	AA large	AAA	Fix
Aaon white	1.99:1	fail	fail	fail	AA: use #218358 as the text (4.72:1) AAA: use #186242 as the text (7.33:1) AA: or shift the background to #474747 (4.67:1) AAA: or shift the background to #2b2b2b (7.11:1)
Aaon black	10.55:1	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 #3fcf91 as the background.

Brands using this color

Palettes built around it

c9a227 7c8aa5 34d399 0c1222 e8edf5

Ledger Dark

Open in tool →

Gold on midnight is the private-banking cue; the mint accent keeps it from feeling old-money stuffy.

Dark Luxury TechnicalFintech

mcpConnect your agent — build around #3fcf91

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 #3fcf91 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link

tool url/palettes/new/3fcf91-a2beb5-d459ca-1f2d2d-e9f1ea?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