Color
#040a3f
#040a3frgb(4, 10, 63)hsl(234, 88%, 13%)oklch(0.19 0.099 267.5)Colors that go with #040a3f
Blue Violet, Charcoal and Rust 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.
Blue Violet #8a2be2
analogousshippedBlue Violet is #040a3f's neighbour on the wheel, so the two read as one family — use it for hover states, gradients and secondary surfaces.
Charcoal #36454f
neutralshippedCharcoal is the text near-black for #040a3f: softer than #000 and cool enough to feel like part of the same palette.
Rust #b7410e
triadicshippedRust completes a triad with #040a3f — three hues spaced evenly round the wheel, the classic way to get energy into a palette without a clash.
Steel Blue #4682b4
analogousshippedSteel Blue is #040a3f'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 #040a3f in 5 real palettes, including Blueprint and Lemon Squeezy's brand system, as the accent — a combination designers have actually shipped, not a computed rotation.
Cadet Blue #5f9ea0
shippedCadet Blue is paired with #040a3f in 8 real palettes, including Arctic and Estate, as the supporting colour — a combination designers have actually shipped, not a computed rotation.
Champagne #f7e7ce
shippedChampagne is paired with #040a3f in 4 real palettes, including Allbirds's brand system and Midnight Luxe, as the accent — a combination designers have actually shipped, not a computed rotation.
Cobalt Blue #0047ab
shippedCobalt Blue is paired with #040a3f in 6 real palettes, including Glacier and Fintech Trust, as the accent — a combination designers have actually shipped, not a computed rotation.
Real palettes that use #040a3f
Tints & shades
Harmonies
Contrast
| #040a3f as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 18.74:1 | pass | pass | pass | Passes AAA — no fix needed. |
Aaon black | 1.12:1 | 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 #040a3f as the background.
Brands using this color
Fonts for this mood
#040a3f reads as cool, vivid, dark. 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 #040a3f and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
/palettes/new/040a3f-9d9cc4-df8a4e-241f2d-e9eef1?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