#a21534 as text	Ratio	AA	AA large	AAA	Fix
Aaon white	7.8:1	pass	pass	pass	Passes AAA — no fix needed.
Aaon black	2.69:1	fail	fail	fail	AA: use #e21d48 as the text (4.5:1) AAA: use #ec6f8a as the text (7.21:1) AA: or shift the background to #c7c7c7 (4.61:1) AAA: or shift the background to #f5f5f5 (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 #a21534 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

9f1239 6b2a47 e5b769 120a10 f5e9ee

Velvet

Open in tool →

Burgundy and plum on near-black with a brass accent — theatre, wine, and anything that wants to feel after-dark.

Luxury Dark Bold

Fonts for this mood

#a21534 reads as warm, vivid, playful. The font library is tagged with the same vocabulary:

Warm fonts →Playful fonts →Bold fonts →

mcpConnect your agent — build around #a21534

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 #a21534 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link

tool url/palettes/new/a21534-c49ca0-62cb82-2d221f-f1e9ef?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