Circuit
Open in tool →Violet plus cyan is the current AI-product signal — pair it with pure black type to keep it from going candy.
Color
#040b0b
#040b0b
hex
#040b0brgb
rgb(4, 11, 11)hsl
hsl(180, 47%, 3%)oklch
oklch(0.141 0.013 195.8)Closest name: Black Knight (#010b13)Relative luminance 0.0029
Colors that go with #040b0b
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 #040b0b without the hard edge of pure #000.
Amber #ffbf00
shippedAmber is paired with #040b0b in 16 real palettes, including Ahrefs's brand system and Mastodon hosted on mastodon.social's brand system, as the supporting colour.
Blue #0000ff
shipped18 real palettes, including Pfizer's brand system and Robinhood's brand system put Blue beside #040b0b, as the supporting colour.
Blue Violet #8a2be2
shippedBlue Violet is paired with #040b0b in 10 real palettes, including Circuit and Render's brand system, as the lead colour.
Brown #a52a2a
shipped4 real palettes, including Velvet and State Farm's brand system put Brown beside #040b0b, as the lead colour.
Burgundy #800020
shipped4 real palettes, including Rare Beauty's brand system and Mailchimp's brand system put Burgundy beside #040b0b, as the supporting colour.
Cadet Blue #5f9ea0
shippedDesigners have shipped Cadet Blue with #040b0b: 6 real palettes, including Estate and Arctic, as the supporting colour.
Champagne #f7e7ce
shipped8 real palettes, including Midnight Luxe and Sweetgreen's brand system put Champagne beside #040b0b, as the text colour against it.
Real palettes that use #040b0b
Tints & shades
Harmonies
Contrast
| #040b0b as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 19.85:1 | pass | pass | pass | Passes AAA — no fix needed. |
Aaon black | 1.06:1 | 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 #040b0b as the background.
Brands using this color
- Buntext · #0a0a0a · Δ1.376
- Framertext · #0a0a0a · Δ1.376
- MetaMaskprimary · #0a0a0a · Δ1.376
- MetaMasktext · #0a0a0a · Δ1.376
- Pfizerprimary · #0a0a0a · Δ1.376
- Pfizertext · #0a0a0a · Δ1.376
- Webflowtext · #080808 · Δ1.474
- Coinbasetext · #0a0b0d · Δ1.49
- Airbusprimary · #070b11 · Δ1.598
- Airbustext · #070b11 · Δ1.598
Palettes built around it
Fonts for this mood
#040b0b reads as cool, dark, luxury. The font library is tagged with the same vocabulary:
mcpConnect your agent — build around #040b0b
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 #040b0b and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
tool url
/palettes/new/040b0b-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