#5e51b3 as text	Ratio	AA	AA large	AAA	Fix
Aaon white	6.36:1	pass	pass	fail	AAA: use #574baa as the text (7.02:1)
Aaon black	3.3:1	fail	pass	fail	AA: use #756abe as the text (4.56:1) AAA: use #968ecd as the text (7.05:1) AA: or shift the background to #d9d9d9 (4.5:1)

Fixes keep hue and saturation and move lightness only, so the suggestion stays on-brand. Ratios are symmetric: the same numbers apply with #5e51b3 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

#5e51b3 reads as cool, modern. The font library is tagged with the same vocabulary:

Modern fonts →

mcpConnect your agent — build around #5e51b3

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 #5e51b3 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link

tool url/palettes/new/5e51b3-a69cc4-dfac4e-271f2d-e9ecf1?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