Campus
Open in tool →Institutional blue with a highlighter-amber accent — trustworthy for parents, lively enough for students.
Color
#212b40
#212b40
hex
#212b40rgb
rgb(33, 43, 64)hsl
hsl(221, 32%, 19%)oklch
oklch(0.29 0.041 264.4)Closest name: Eternal Darkness (#1c2841)Relative luminance 0.0242
Colors that go with #212b40
Dark Olive Green, Sea Green 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.
Dark Olive Green #556b2f
complementaryshippedDark Olive Green sits directly opposite #212b40 on the wheel — the strongest contrast one hue can give another, so use it small: a button, a link colour, one highlight.
Sea Green #2e8b57
triadicshippedSea Green completes a triad with #212b40 — three hues spaced evenly round the wheel, the classic way to get energy into a palette without a clash.
Sienna #a0522d
split-complementshippedSienna is a split-complement of #212b40: nearly opposite, so it still pops against it, without the vibrating edge of a true complement.
Slate Blue #6a5acd
analogousshippedSlate Blue is #212b40's neighbour on the wheel, so the two read as one family — use it for hover states, gradients and secondary surfaces.
Steel Blue #4682b4
analogousshippedSteel Blue is #212b40'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 #212b40 in 17 real palettes, including Beach Hut and McDonald's's brand system, as the supporting colour.
Blue #0000ff
shipped23 real palettes, including Monzo's brand system and Sketch's brand system put Blue beside #212b40, as the accent.
White Smoke #f5f5f5
neutralWhite Smoke is the surface for #212b40: a clean near-white with no warm cast, so the cool hue stays clear instead of drifting muddy.
Real palettes that use #212b40
Tints & shades
Harmonies
Contrast
| #212b40 as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 14.15:1 | pass | pass | pass | Passes AAA — no fix needed. |
Aaon black | 1.48:1 | 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 #212b40 as the background.
Brands using this color
Palettes built around it
Open House
Open in tool →Steel blue for trust, warm gold for the sold moment — an approachable brokerage that still feels established.
Coastal
Open in tool →Sea-teal, sky and sand — bright without shouting; works for travel, wellness, and anything near water.
Beach Hut
Open in tool →Sea blue with sun-bleached yellow and a coral — striped-canvas summer, softened so it works on a screen.
Fonts for this mood
#212b40 reads as cool, muted, dark. The font library is tagged with the same vocabulary:
mcpConnect your agent — build around #212b40
live endpointPoint 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.
endpoint
https://mcp.brandsweets.com/colors/mcpclaude mcp add --transport http brandsweets-colors https://mcp.brandsweets.com/colors/mcp
try this prompt
›analyze #212b40 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
tool url
/palettes/new/212b40-9ca4c4-df6b4e-211f2d-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