CSS color
darkblue
#00008brgb(0, 0, 139)hsl(240, 100%, 27%)oklch(0.288 0.199 264.1)Darkblue on this page is the real value, not a screenshot: exact hex, RGB, HSL and OKLCH, ten tints and ten shades, classic harmonies, and WCAG contrast with fixes — plus the 1 public brand that uses it and the palettes it appears in.
Colors that go with darkblue
Steel Blue, Cobalt Blue 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.
Steel Blue #4682b4
analogousshippedSteel Blue is darkblue's neighbour on the wheel, so the two read as one family — use it for hover states, gradients and secondary surfaces.
Cobalt Blue #0047ab
shippedDesigners have shipped Cobalt Blue with darkblue: 4 real palettes, including Purina Pro Plan's brand system and Tide's brand system, as the accent.
Crimson #dc143c
triadicshippedCrimson completes a triad with darkblue — 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 darkblue in 4 real palettes, including Discord's brand system and Nivea's brand system, as the lead colour.
Olive Green #808000
complementaryOlive Green sits directly opposite darkblue on the wheel — the strongest contrast one hue can give another, so use it small: a button, a link colour, one highlight.
Charcoal #36454f
neutralshippedCharcoal is the text near-black for darkblue: softer than #000 and cool enough to feel like part of the same palette.
Orange Red #ff4500
shippedOrange Red is paired with darkblue in 3 real palettes, including Tide's brand system and NASA's brand system, as the accent.
Sienna #a0522d
split-complementSienna is a split-complement of darkblue: nearly opposite, so it still pops against it, without the vibrating edge of a true complement.
Real palettes that use darkblue
Tints & shades
Harmonies
Contrast
| darkblue as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 15.3:1 | pass | pass | pass | Passes AAA — no fix needed. |
Aaon black | 1.37:1 | 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 darkblue as the background.
Brands using this color
Fonts for this mood
darkblue 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 #00008b and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
/palettes/new/00008b-a19cc4-df994e-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