#3f5f92 as text	Ratio	AA	AA large	AAA	Fix
Aaon white	6.44:1	pass	pass	fail	AAA: use #3a5888 as the text (7.16:1)
Aaon black	3.26:1	fail	pass	fail	AA: use #5076b4 as the text (4.59:1) AAA: use #7b98c6 as the text (7.15:1) AA: or shift the background to #d9d9d9 (4.56:1)

Fixes keep hue and saturation and move lightness only, so the suggestion stays on-brand. Ratios are symmetric: the same numbers apply with #3f5f92 as the background.

Brands using this color

No public brand in the corpus uses this exact color yet. Extract a brand to add one.

Palettes built around it

4b5d8a 8b97b3 c07a4e eef0f4 1f2430

Dusk

Open in tool →

Slate blue with a copper accent — calm, professional, slightly editorial; suits consultancies and journals.

Cool Muted Elegant

Fonts for this mood

#3f5f92 reads as cool, modern. The font library is tagged with the same vocabulary:

Modern fonts →

mcpConnect your agent — build around #3f5f92

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 #3f5f92 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link

tool url/palettes/new/3f5f92-9ca7c4-df624e-201f2d-e9f0f1?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