#515b8a as text	Ratio	AA	AA large	AAA	Fix
Aaon white	6.54:1	pass	pass	fail	AAA: use #4b5581 as the text (7.2:1)
Aaon black	3.21:1	fail	pass	fail	AA: use #6873a6 as the text (4.59:1) AAA: use #8b94bb as the text (7.05:1) AA: or shift the background to #d9d9d9 (4.63:1)

Fixes keep hue and saturation and move lightness only, so the suggestion stays on-brand. Ratios are symmetric: the same numbers apply with #515b8a 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

mcpConnect your agent — build around #515b8a

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 #515b8a and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link

tool url/palettes/new/515b8a-9c9fc4-df7e4e-231f2d-e9eef1?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