#10151e as text	Ratio	AA	AA large	AAA	Fix
Aaon white	18.29:1	pass	pass	pass	Passes AAA — no fix needed.
Aaon black	1.15:1	fail	fail	fail	AA: use #5d77a8 as the text (4.67:1) AAA: use #8498bd as the text (7.21:1) AA: or shift the background to #808080 (4.63:1) AAA: or shift the background to #a1a1a1 (7.08:1)

Fixes keep hue and saturation and move lightness only, so the suggestion stays on-brand. Ratios are symmetric: the same numbers apply with #10151e as the background.

Brands using this color

Palettes built around it

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

c9a227 7c8aa5 34d399 0c1222 e8edf5

Ledger Dark

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Gold on midnight is the private-banking cue; the mint accent keeps it from feeling old-money stuffy.

Dark Luxury TechnicalFintech

b08d57 8a97a5 c9c9c9 101418 eef1f4

Estate

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Bronze on charcoal signals premium listings; the silver accent handles secondary detail without adding color.

Luxury Dark ElegantReal Estate

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

#10151e reads as cool, muted, dark. The font library is tagged with the same vocabulary:

Luxury fonts →Bold fonts →

mcpConnect your agent — build around #10151e

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 #10151e and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link

tool url/palettes/new/10151e-9ca5c4-df664e-211f2d-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