Color
#043d9f
#043d9frgb(4, 61, 159)hsl(218, 95%, 32%)oklch(0.397 0.168 261.2)Colors that go with #043d9f
Charcoal, Crimson 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.
Charcoal #36454f
neutralshippedCharcoal is the text near-black for #043d9f: softer than #000 and cool enough to feel like part of the same palette.
Crimson #dc143c
triadicshippedCrimson completes a triad with #043d9f — 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 #043d9f's neighbour on the wheel, so the two read as one family — use it for hover states, gradients and secondary surfaces.
Blue #0000ff
shipped7 real palettes, including Procter & Gamble's brand system and CVS's brand system put Blue beside #043d9f, as the supporting colour.
Cornflower Blue #6495ed
shippedDesigners have shipped Cornflower Blue with #043d9f: 4 real palettes, including Blue Mono and Gopro's brand system, as the supporting colour.
Denim #1560bd
shippedDesigners have shipped Denim with #043d9f: 13 real palettes, including Warbyparker's brand system and Unilever's brand system, as the accent.
Firebrick #b22222
shippedDesigners have shipped Firebrick with #043d9f: 5 real palettes, including MLB's brand system and 3M's brand system, as the supporting colour.
Midnight Blue #191970
shipped18 real palettes, including Fintech Trust and Blue Mono put Midnight Blue beside #043d9f, as that palette's text colour.
Real palettes that use #043d9f
Tints & shades
Harmonies
Contrast
| #043d9f as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 9.66:1 | pass | pass | pass | Passes AAA — no fix needed. |
Aaon black | 2.17:1 | 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 #043d9f as the background.
Brands using this color
Fonts for this mood
#043d9f 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 #043d9f and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
/palettes/new/043d9f-9ca6c4-df644e-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