#511b9d as text	Ratio	AA	AA large	AAA	Fix
Aaon white	10.53:1	pass	pass	pass	Passes AAA — no fix needed.
Aaon black	1.99:1	fail	fail	fail	AA: use #9055e2 as the text (4.58:1) AAA: use #ac81ea as the text (7.08:1) AA: or shift the background to #ababab (4.59:1) AAA: or shift the background to #d4d4d4 (7.11:1)

Fixes keep hue and saturation and move lightness only, so the suggestion stays on-brand. Ratios are symmetric: the same numbers apply with #511b9d as the background.

Brands using this color

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

Fonts for this mood

#511b9d reads as cool, vivid, technical. The font library is tagged with the same vocabulary:

Technical fonts →Modern fonts →

mcpConnect your agent — build around #511b9d

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 #511b9d and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link

tool url/palettes/new/511b9d-b19cc4-dfd54e-2b1f2d-e9eaf1?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