Color
#0a031b
#0a031brgb(10, 3, 27)hsl(258, 80%, 6%)oklch(0.134 0.054 294.4)Colors that go with #0a031b
Charcoal, Royal Blue and Sea Green 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 #0a031b: softer than #000 and cool enough to feel like part of the same palette.
Royal Blue #4169e1
analogousshippedRoyal Blue is #0a031b's neighbour on the wheel, so the two read as one family — use it for hover states, gradients and secondary surfaces.
Sea Green #2e8b57
split-complementshippedSea Green is a split-complement of #0a031b: nearly opposite, so it still pops against it, without the vibrating edge of a true complement.
Teal #008080
triadicshippedTeal completes a triad with #0a031b — three hues spaced evenly round the wheel, the classic way to get energy into a palette without a clash.
Amber #ffbf00
shippedAmber is paired with #0a031b in 14 real palettes, including Southwest Airlines's brand system and Lemon Squeezy's brand system, as the accent.
Blue #0000ff
shipped16 real palettes, including Pfizer's brand system and Glossier's brand system put Blue beside #0a031b, as the supporting colour.
Blue Violet #8a2be2
shippedBlue Violet is paired with #0a031b in 9 real palettes, including Gemstone and Circuit, as the supporting colour.
Brown #a52a2a
shipped4 real palettes, including Velvet and Garnet put Brown beside #0a031b, as the lead colour.
Real palettes that use #0a031b
Tints & shades
Harmonies
Contrast
| #0a031b as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 20.16:1 | pass | pass | pass | Passes AAA — no fix needed. |
Aaon black | 1.04:1 | 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 #0a031b as the background.
Brands using this color
Fonts for this mood
#0a031b 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 #0a031b and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
/palettes/new/0a031b-ad9cc4-dfc44e-291f2d-e9ebf1?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