Color
#0d2f4f
#0d2f4frgb(13, 47, 79)hsl(209, 72%, 18%)oklch(0.299 0.07 250.3)Colors that go with #0d2f4f
Crimson, Rust and Sienna 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 #0d2f4f — three hues spaced evenly round the wheel, the classic way to get energy into a palette without a clash.
Rust #b7410e
split-complementshippedRust is a split-complement of #0d2f4f: nearly opposite, so it still pops against it, without the vibrating edge of a true complement.
Sienna #a0522d
complementaryshippedSienna sits directly opposite #0d2f4f on the wheel — the strongest contrast one hue can give another, so use it small: a button, a link colour, one highlight.
Slate Blue #6a5acd
analogousshippedSlate Blue is #0d2f4f's neighbour on the wheel, so the two read as one family — use it for hover states, gradients and secondary surfaces.
Teal #008080
analogousshippedTeal is #0d2f4f'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 #0d2f4f in 8 real palettes, including Beach Hut and Southwest Airlines's brand system, as the supporting colour.
Blue #0000ff
shipped18 real palettes, including Monzo's brand system and Sketch's brand system put Blue beside #0d2f4f, as the accent.
White Smoke #f5f5f5
neutralWhite Smoke is the surface for #0d2f4f: a clean near-white with no warm cast, so the cool hue stays clear instead of drifting muddy.
Real palettes that use #0d2f4f
Tints & shades
Harmonies
Contrast
| #0d2f4f as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 13.67:1 | pass | pass | pass | Passes AAA — no fix needed. |
Aaon black | 1.54:1 | 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 #0d2f4f as the background.
Brands using this color
Fonts for this mood
#0d2f4f 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 #0d2f4f and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
/palettes/new/0d2f4f-9cacc4-df4e4e-1f212d-e9f1f1?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