#21242b as text	Ratio	AA	AA large	AAA	Fix
Aaon white	15.53:1	pass	pass	pass	Passes AAA — no fix needed.
Aaon black	1.35:1	fail	fail	fail	AA: use #6d768d as the text (4.63:1) AAA: use #8f96a8 as the text (7.1:1) AA: or shift the background to #8c8c8c (4.62:1) AAA: or shift the background to #b0b0b0 (7.16:1)

Fixes keep hue and saturation and move lightness only, so the suggestion stays on-brand. Ratios are symmetric: the same numbers apply with #21242b as the background.

Brands using this color

Palettes built around it

ff5e5b 00cecb ffed66 ffffff 222222

Crayon Box

Open in tool →

Red, teal and yellow at crayon saturation — joyful, but on white with black type so it stays readable for grown-ups.

Playful Vivid FriendlyKids

4b5d8a 8b97b3 c07a4e eef0f4 1f2430

Dusk

Open in tool →

Slate blue with a copper accent — calm, professional, slightly editorial; suits consultancies and journals.

Cool Muted Elegant

Fonts for this mood

#21242b reads as cool, muted, dark. The font library is tagged with the same vocabulary:

Luxury fonts →Bold fonts →

mcpConnect your agent — build around #21242b

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 #21242b and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link

tool url/palettes/new/21242b-9ca3c4-df6e4e-211f2d-e9eff1?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