#39313f as text	Ratio	AA	AA large	AAA	Fix
Aaon white	12.46:1	pass	pass	pass	Passes AAA — no fix needed.
Aaon black	1.69:1	fail	fail	fail	AA: use #826f90 as the text (4.63:1) AAA: use #a092ab as the text (7.19:1) AA: or shift the background to #9c9c9c (4.54:1) AAA: or shift the background to #c4c4c4 (7.15:1)

Fixes keep hue and saturation and move lightness only, so the suggestion stays on-brand. Ratios are symmetric: the same numbers apply with #39313f as the background.

Brands using this color

Mercuryprimary · #323341 · Δ1.299

Fonts for this mood

#39313f reads as cool, muted, dark. The font library is tagged with the same vocabulary:

Luxury fonts →Bold fonts →

mcpConnect your agent — build around #39313f

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 #39313f and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link

tool url/palettes/new/39313f-b79cc4-c2cb62-2d1f2d-eae9f1?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