Color
#03299b
#03299brgb(3, 41, 155)hsl(225, 96%, 31%)oklch(0.356 0.187 263.9)Colors that go with #03299b
Crimson, Steel Blue and 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 #03299b — 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 #03299b's neighbour on the wheel, so the two read as one family — use it for hover states, gradients and secondary surfaces.
Blue #0000ff
shippedBlue is paired with #03299b in 6 real palettes, including Pepsi's brand system and Procter & Gamble's brand system, as the supporting colour — a combination designers have actually shipped, not a computed rotation.
Charcoal #36454f
neutralshippedCharcoal is the text near-black for #03299b: softer than #000 and cool enough to feel like part of the same palette.
Denim #1560bd
shippedDenim is paired with #03299b in 5 real palettes, including Google's brand system and Bank of America's brand system, as the accent — a combination designers have actually shipped, not a computed rotation.
Royal Blue #4169e1
shippedRoyal Blue is paired with #03299b in 6 real palettes, including Nivea's brand system and Discord's brand system, as the supporting colour — a combination designers have actually shipped, not a computed rotation.
Olive Green #808000
complementaryOlive Green sits directly opposite #03299b on the wheel — the strongest contrast one hue can give another, so use it small: a button, a link colour, one highlight.
Sienna #a0522d
split-complementSienna is a split-complement of #03299b: nearly opposite, so it still pops against it, without the vibrating edge of a true complement.
Real palettes that use #03299b
Tints & shades
Harmonies
Contrast
| #03299b as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 11.7:1 | pass | pass | pass | Passes AAA — no fix needed. |
Aaon black | 1.79:1 | 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 #03299b as the background.
Brands using this color
Fonts for this mood
#03299b 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 #03299b and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
/palettes/new/03299b-9ca1c4-df754e-221f2d-e9eff1?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