#3fd59e as text	Ratio	AA	AA large	AAA	Fix
Aaon white	1.87:1	fail	fail	fail	AA: use #1d8660 as the text (4.53:1) AAA: use #166448 as the text (7.12:1) AA: or shift the background to #4d4d4d (4.52:1) AAA: or shift the background to #303030 (7.05:1)
Aaon black	11.22:1	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 #3fd59e 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

ff6b35 ffd166 06d6a0 ffffff 1f1f1f

Fresh Juice

Open in tool →

Orange, mango and mint — a sugar rush; keep the type black so it stays legible under all that color.

Playful Vivid LightFood

mcpConnect your agent — build around #3fd59e

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 #3fd59e and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link

tool url/palettes/new/3fd59e-a2beb7-d459c2-1f2c2d-e9f1eb?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