#191721 as text	Ratio	AA	AA large	AAA	Fix
Aaon white	17.71:1	pass	pass	pass	Passes AAA — no fix needed.
Aaon black	1.19:1	fail	fail	fail	AA: use #776f9b as the text (4.53:1) AAA: use #9993b4 as the text (7.19:1) AA: or shift the background to #828282 (4.61:1) AAA: or shift the background to #a3a3a3 (7.02:1)

Fixes keep hue and saturation and move lightness only, so the suggestion stays on-brand. Ratios are symmetric: the same numbers apply with #191721 as the background.

Brands using this color

Palettes built around it

2563eb 52525b 16a34a fafafa 18181b

Console Light

Open in tool →

A sober docs palette: one blue for interactive, one green for success, zinc greys for everything else.

Technical Clean Light

a1a1aa 71717a f59e0b 18181b f4f4f5

Graphite

Open in tool →

A greyscale system with a single amber — the accent does all the work, so allow one per screen.

Technical Muted Dark Modern

4f46e5 6b7280 10b981 ffffff 111827

Indigo SaaS

Open in tool →

The dependable indigo-and-emerald B2B pairing: indigo for primary actions, emerald reserved for success states.

Modern Cool CleanSaas

1e40af 111827 fb7185 ffffff

Cobalt Pop

Open in tool →

One deep cobalt and one hot pink on white — a two-accent system for launches and campaign pages that need punch.

Bold Cool Vivid Modern

Fonts for this mood

#191721 reads as cool, muted, dark. The font library is tagged with the same vocabulary:

Luxury fonts →Bold fonts →

mcpConnect your agent — build around #191721

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 #191721 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link

tool url/palettes/new/191721-a99cc4-dfb64e-281f2d-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