Color
#21566e
#21566ergb(33, 86, 110)hsl(199, 54%, 28%)oklch(0.429 0.068 231)Colors that go with #21566e
Crimson, Royal Blue 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
split-complementshippedCrimson is a split-complement of #21566e: nearly opposite, so it still pops against it, without the vibrating edge of a true complement.
Royal Blue #4169e1
analogousshippedRoyal Blue is #21566e's neighbour on the wheel, so the two read as one family — use it for hover states, gradients and secondary surfaces.
Sienna #a0522d
complementaryshippedSienna sits directly opposite #21566e on the wheel — the strongest contrast one hue can give another, so use it small: a button, a link colour, one highlight.
Blue #0000ff
shipped7 real palettes, including Alaska Airlines's brand system and Jeep's brand system put Blue beside #21566e, as the accent.
Cadet Blue #5f9ea0
shippedDesigners have shipped Cadet Blue with #21566e: 4 real palettes, including Open House and Dusk, as the supporting colour.
Denim #1560bd
shippedDesigners have shipped Denim with #21566e: 14 real palettes, including HP's brand system and Hinge's brand system, as the accent.
Goldenrod #daa520
shippedGoldenrod shows up next to #21566e in 5 real palettes, including Fireside and Open House, as the accent.
White Smoke #f5f5f5
neutralWhite Smoke is the surface for #21566e: a clean near-white with no warm cast, so the cool hue stays clear instead of drifting muddy.
Real palettes that use #21566e
Tints & shades
Harmonies
Contrast
| #21566e as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 8.01:1 | pass | pass | pass | Passes AAA — no fix needed. |
Aaon black | 2.62:1 | 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 #21566e as the background.
Brands using this color
No public brand in the corpus uses this exact color yet. Extract a brand to add one.
Fonts for this mood
#21566e reads as cool, dark, luxury. 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 #21566e and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
/palettes/new/21566e-9cb3c4-df4e66-1f232d-e9f1f0?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