Chalkboard
Open in tool →Slate green with chalk cream and a coral — nostalgic without being twee.
Color
#152828
#152828
hex
#152828rgb
rgb(21, 40, 40)hsl
hsl(180, 31%, 12%)oklch
oklch(0.261 0.025 195.7)Closest name: Black Box (#0f282f)Relative luminance 0.0183
Colors that go with #152828
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 #152828 without the hard edge of pure #000.
Amber #ffbf00
shippedAmber is paired with #152828 in 18 real palettes, including Wikipedia's brand system and Beach Hut, as the accent.
Blue #0000ff
shipped24 real palettes, including Rolex's brand system and Readymag's brand system put Blue beside #152828, as the accent.
Blue Violet #8a2be2
shippedBlue Violet is paired with #152828 in 10 real palettes, including ClickUp's brand system and Yahoo's brand system, as the lead colour.
Blush Pink #e8b4b8
shipped6 real palettes, including Graphite Mono and Rain Garden put Blush Pink beside #152828, as the accent.
Brown #a52a2a
shipped5 real palettes, including Typewriter and Woodsmoke put Brown beside #152828, as the accent.
Burlywood #deb887
shippedBurlywood is paired with #152828 in 6 real palettes, including Chalkboard and Kiln, as the lead colour.
Cadet Blue #5f9ea0
shippedDesigners have shipped Cadet Blue with #152828: 10 real palettes, including Paper & Pine and SoFi's brand system, as the supporting colour.
Real palettes that use #152828
Tints & shades
Harmonies
Contrast
| #152828 as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 15.37:1 | 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 #152828 as the background.
Brands using this color
Palettes built around it
Fonts for this mood
#152828 reads as cool, muted, dark. The font library is tagged with the same vocabulary:
mcpConnect your agent — build around #152828
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 #152828 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
tool url
/palettes/new/152828-a2bbbe-d45994-1f272d-e9f1ed?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