Color
#21174f
#21174frgb(33, 23, 79)hsl(251, 55%, 20%)oklch(0.256 0.098 285.4)Colors that go with #21174f
Charcoal, 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.
Charcoal #36454f
neutralshippedCharcoal is the text near-black for #21174f: softer than #000 and cool enough to feel like part of the same palette.
Sea Green #2e8b57
split-complementshippedSea Green is a split-complement of #21174f: nearly opposite, so it still pops against it, without the vibrating edge of a true complement.
Sienna #a0522d
split-complementshippedSienna is a split-complement of #21174f: nearly opposite, so it still pops against it, without the vibrating edge of a true complement.
Steel Blue #4682b4
analogousshippedSteel Blue is #21174f's neighbour on the wheel, so the two read as one family — use it for hover states, gradients and secondary surfaces.
Teal #008080
triadicshippedTeal completes a triad with #21174f — three hues spaced evenly round the wheel, the classic way to get energy into a palette without a clash.
Amber #ffbf00
shippedAmber is paired with #21174f in 9 real palettes, including Southwest Airlines's brand system and Beach Hut, as the accent.
Blue #0000ff
shipped15 real palettes, including Sketch's brand system and Monzo's brand system put Blue beside #21174f, as the accent.
Blush Pink #e8b4b8
shipped4 real palettes, including Graphite Mono and Estate put Blush Pink beside #21174f, as the accent.
Real palettes that use #21174f
Tints & shades
Harmonies
Contrast
| #21174f as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 16.15:1 | pass | pass | pass | Passes AAA — no fix needed. |
Aaon black | 1.3:1 | 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 #21174f as the background.
Brands using this color
Fonts for this mood
#21174f 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 #21174f and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
/palettes/new/21174f-a89cc4-dfb34e-281f2d-e9ecf1?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