#ef5b2e as text	Ratio	AA	AA large	AAA	Fix
Aaon white	3.38:1	fail	pass	fail	AA: use #d53e10 as the text (4.64:1) AAA: use #a12f0c as the text (7.17:1) AA: or shift the background to #242424 (4.59:1)
Aaon black	6.21:1	pass	pass	fail	AAA: use #f16e46 as the text (7.06:1)

Fixes keep hue and saturation and move lightness only, so the suggestion stays on-brand. Ratios are symmetric: the same numbers apply with #ef5b2e as the background.

Brands using this color

Palettes built around it

ea580c 1c1917 0891b2 ffffff

Launch Orange

Open in tool →

Orange is the rarest SaaS primary, which is exactly why it stands out on a pricing page; cyan keeps it from feeling like a hardware store.

Bold Warm Vivid ModernSaas

f25f29 b03a2e f2c14e 14100e f8ede3

Ember

Open in tool →

Flame orange on charcoal — the sports and energy palette; one accent yellow for stats and highlights.

Bold Dark Warm

Fonts for this mood

#ef5b2e 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 #ef5b2e

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 #ef5b2e and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link

tool url/palettes/new/ef5b2e-c4aa9c-62cbb1-2d291f-f1e9eb?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