Color
#040aa4
#040aa4rgb(4, 10, 164)hsl(238, 95%, 33%)oklch(0.332 0.22 264.8)Colors that go with #040aa4
Crimson, Royal Blue 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.
Crimson #dc143c
triadicshippedCrimson completes a triad with #040aa4 — three hues spaced evenly round the wheel, the classic way to get energy into a palette without a clash.
Royal Blue #4169e1
shippedRoyal Blue is paired with #040aa4 in 4 real palettes, including Nivea's brand system and Discord's brand system, as the supporting colour.
Steel Blue #4682b4
analogousshippedSteel Blue is #040aa4's neighbour on the wheel, so the two read as one family — use it for hover states, gradients and secondary surfaces.
Olive Green #808000
complementaryOlive Green sits directly opposite #040aa4 on the wheel — the strongest contrast one hue can give another, so use it small: a button, a link colour, one highlight.
Blue #0000ff
shipped3 real palettes, including Pepsi's brand system and Pfizer's brand system put Blue beside #040aa4, as the supporting colour.
Charcoal #36454f
neutralshippedCharcoal is the text near-black for #040aa4: softer than #000 and cool enough to feel like part of the same palette.
Cobalt Blue #0047ab
shippedDesigners have shipped Cobalt Blue with #040aa4: 3 real palettes, including Tide's brand system and Purina Pro Plan's brand system, as the lead colour.
Sienna #a0522d
split-complementSienna is a split-complement of #040aa4: nearly opposite, so it still pops against it, without the vibrating edge of a true complement.
Real palettes that use #040aa4
Tints & shades
Harmonies
Contrast
| #040aa4 as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 13.25:1 | pass | pass | pass | Passes AAA — no fix needed. |
Aaon black | 1.58:1 | 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 #040aa4 as the background.
Brands using this color
Fonts for this mood
#040aa4 reads as cool, vivid, technical. 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 #040aa4 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
/palettes/new/040aa4-9f9cc4-df944e-251f2d-e9edf1?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