Color
#031b40
#031b40rgb(3, 27, 64)hsl(216, 91%, 13%)oklch(0.23 0.077 258.4)Colors that go with #031b40
Blue Violet, Charcoal and Crimson 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 #031b40'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 #031b40: softer than #000 and cool enough to feel like part of the same palette.
Crimson #dc143c
triadicshippedCrimson completes a triad with #031b40 — three hues spaced evenly round the wheel, the classic way to get energy into a palette without a clash.
Sienna #a0522d
complementaryshippedSienna sits directly opposite #031b40 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 #031b40'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 #031b40 in 18 real palettes, including Southwest Airlines's brand system and Blueprint, as the accent.
Blue #0000ff
shipped20 real palettes, including Monzo's brand system and Penpot's brand system put Blue beside #031b40, as the accent.
Blush Pink #e8b4b8
shipped5 real palettes, including Estate and Graphite Mono put Blush Pink beside #031b40, as the accent.
Real palettes that use #031b40
Tints & shades
Harmonies
Contrast
| #031b40 as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 17.01:1 | pass | pass | pass | Passes AAA — no fix needed. |
Aaon black | 1.23:1 | 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 #031b40 as the background.
Brands using this color
Fonts for this mood
#031b40 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 #031b40 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
/palettes/new/031b40-9ca7c4-df5f4e-201f2d-e9f0f1?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