#5900b3 as text	Ratio	AA	AA large	AAA	Fix
Aaon white	10.12:1	pass	pass	pass	Passes AAA — no fix needed.
Aaon black	2.08:1	fail	fail	fail	AA: use #9e3dff as the text (4.57:1) AAA: use #ba75ff as the text (7.08:1) AA: or shift the background to #adadad (4.51:1) AAA: or shift the background to #d9d9d9 (7.17:1)

Fixes keep hue and saturation and move lightness only, so the suggestion stays on-brand. Ratios are symmetric: the same numbers apply with #5900b3 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

#5900b3 reads as cool, vivid, technical. The font library is tagged with the same vocabulary:

Technical fonts →Modern fonts →

mcpConnect your agent — build around #5900b3

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 #5900b3 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link

tool url/palettes/new/5900b3-b59cc4-c9cb62-2c1f2d-eae9f1?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