#378cfb as text	Ratio	AA	AA large	AAA	Fix
Aaon white	3.33:1	fail	pass	fail	AA: use #056ffa as the text (4.51:1) AAA: use #0452b9 as the text (7.21:1) AA: or shift the background to #262626 (4.54:1)
Aaon black	6.31:1	pass	pass	fail	AAA: use #4b97fb as the text (7.12:1)

Fixes keep hue and saturation and move lightness only, so the suggestion stays on-brand. Ratios are symmetric: the same numbers apply with #378cfb as the background.

Brands using this color

HashiCorpsecondary · #2b89ff · Δ1.301

Palettes built around it

1a1a1a 8c8c8c 3a86ff f2f2f2

Studio Grey

Open in tool →

A pure greyscale with a single electric blue — the portfolio palette that makes work look considered.

Minimal Muted Modern

Fonts for this mood

#378cfb reads as cool, vivid, technical. The font library is tagged with the same vocabulary:

Technical fonts →Modern fonts →

mcpConnect your agent — build around #378cfb

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 #378cfb and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link

tool url/palettes/new/378cfb-9ca9c4-df5a4e-1f1f2d-e9f0f1?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