Chalkboard
Open in tool →Slate green with chalk cream and a coral — nostalgic without being twee.
Color
#21271b
#21271b
hex
#21271brgb
rgb(33, 39, 27)hsl
hsl(90, 18%, 13%)oklch
oklch(0.263 0.023 129.5)Closest name: Underworld (#1e231c)Relative luminance 0.0185
Colors that go with #21271b
Charcoal, Amber and Blue lead the list. Each partner is a real named colour with the reason it works — a wheel relationship, a neutral that carries it, or a pairing lifted from a palette or brand system that actually shipped — and every pair opens in the palette tool.
Charcoal #36454f
neutralshippedCharcoal is the text near-black that reads cleanly against #21271b without the hard edge of pure #000.
Amber #ffbf00
shippedAmber is paired with #21271b in 18 real palettes, including Wikipedia's brand system and McDonald's's brand system, as the accent.
Blue #0000ff
shipped23 real palettes, including Readymag's brand system and Headspace's brand system put Blue beside #21271b, as the supporting colour.
Blue Violet #8a2be2
shippedBlue Violet is paired with #21271b in 9 real palettes, including ClickUp's brand system and Yahoo's brand system, as the lead colour.
Blush Pink #e8b4b8
shipped7 real palettes, including Graphite Mono and Rain Garden put Blush Pink beside #21271b, as the accent.
Brown #a52a2a
shipped5 real palettes, including Typewriter and Woodsmoke put Brown beside #21271b, as the accent.
Burlywood #deb887
shippedBurlywood is paired with #21271b in 6 real palettes, including Chalkboard and Kiln, as the lead colour.
Cadet Blue #5f9ea0
shippedDesigners have shipped Cadet Blue with #21271b: 10 real palettes, including Paper & Pine and SoFi's brand system, as the supporting colour.
Real palettes that use #21271b
Tints & shades
Harmonies
Contrast
| #21271b as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 15.32:1 | pass | pass | pass | Passes AAA — no fix needed. |
Aaon black | 1.37:1 | fail | fail | fail |
Fixes keep hue and saturation and move lightness only, so the suggestion stays on-brand. Ratios are symmetric: the same numbers apply with #21271b as the background.
Brands using this color
Palettes built around it
Forest Floor
Open in tool →Moss and bark with a mushroom-cap amber — grounded and quiet, made for long-form nature content.
Riverbed
Open in tool →Wet-stone green and pebble grey with a copper accent — an earth palette that leans cool, for outdoor and wellness.
Undergrowth
Open in tool →Fern and lichen with a fungus orange on a fir-black — the forest floor at dusk, as a dark theme.
Fonts for this mood
#21271b reads as muted, dark, luxury. The font library is tagged with the same vocabulary:
mcpConnect your agent — build around #21271b
live endpointPoint any MCP client at the shared colors endpoint and your agent gets the same engine as this page — direct_palette, edit_direction, check_palette, check_contrast — read-only, no key. Every direction it proposes comes with a /colors/d/… link: open it, lock what you like, paste the link back, and the agent edits rather than re-rolls.
endpoint
https://mcp.brandsweets.com/colors/mcpclaude mcp add --transport http brandsweets-colors https://mcp.brandsweets.com/colors/mcp
try this prompt
›analyze #21271b and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
tool url
/palettes/new/21271b-adbea2-514edf-202d1f-f1f1e9?lock=0&style=vibrantWant the agent to remember your picks and write them into a living brand? Create a free BrandSweets workspace.
Machine-readable: color.md