Color
Black Box
#0f282frgb(15, 40, 47)hsl(193, 52%, 12%)oklch(0.26 0.033 218.6)Colors that go with Black Box
Charcoal, Sienna and Steel 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 for Black Box: softer than #000 and cool enough to feel like part of the same palette.
Sienna #a0522d
complementaryshippedSienna sits directly opposite Black Box on the wheel — the strongest contrast one hue can give another, so use it small: a button, a link colour, one highlight.
Steel Blue #4682b4
analogousshippedSteel Blue is Black Box's neighbour on the wheel, so the two read as one family — use it for hover states, gradients and secondary surfaces.
Teal #008080
analogousshippedTeal is Black Box's neighbour on the wheel, so the two read as one family — use it for hover states, gradients and secondary surfaces.
Amber #ffbf00
shippedAmber is paired with Black Box in 18 real palettes, including Beach Hut and Wikipedia's brand system, as the supporting colour.
Blue #0000ff
shipped23 real palettes, including Monzo's brand system and Rolex's brand system put Blue beside Black Box, as the accent.
Blue Violet #8a2be2
shippedBlue Violet is paired with Black Box in 9 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 Black Box, as the accent.
Real palettes that use Black Box
Tints & shades
Harmonies
Contrast
| Black Box as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 15.39:1 | pass | pass | pass | Passes AAA — no fix needed. |
Aaon black | 1.36:1 | 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 Black Box as the background.
Brands using this color
Fonts for this mood
Black Box reads as cool, dark, luxury. The font library is tagged with the same vocabulary:
Point 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.
https://mcp.brandsweets.com/colors/mcpclaude mcp add --transport http brandsweets-colors https://mcp.brandsweets.com/colors/mcp
›analyze #0f282f and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
/palettes/new/0f282f-a2b5be-df4e75-1f242d-e9f1ef?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