Dusk Gradient
Open in tool →Orange and peach on indigo-black with a violet — the last five minutes of a sunset, as a dark mode.
Color
#21102d
#21102d
hex
#21102drgb
rgb(33, 16, 45)hsl
hsl(275, 48%, 12%)oklch
oklch(0.213 0.058 309.4)Closest name: Midnight Monarch (#1c0f33)Relative luminance 0.0088
Colors that go with #21102d
Charcoal, Dark Olive Green and Sea Green 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 #21102d: softer than #000 and cool enough to feel like part of the same palette.
Dark Olive Green #556b2f
complementaryshippedDark Olive Green sits directly opposite #21102d 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
split-complementshippedSea Green is a split-complement of #21102d: nearly opposite, so it still pops against it, without the vibrating edge of a true complement.
Sienna #a0522d
triadicshippedSienna completes a triad with #21102d — three hues spaced evenly round the wheel, the classic way to get energy into a palette without a clash.
Slate Blue #6a5acd
analogousshippedSlate Blue is #21102d'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 #21102d — 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 #21102d in 18 real palettes, including Blueprint and Southwest Airlines's brand system, as the accent.
Blue #0000ff
shipped21 real palettes, including Warp's brand system and League of Legends's brand system put Blue beside #21102d, as the supporting colour.
Real palettes that use #21102d
Tints & shades
Harmonies
Contrast
| #21102d as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 17.85:1 | pass | pass | pass | Passes AAA — no fix needed. |
Aaon black | 1.18:1 | 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 #21102d as the background.
Brands using this color
No public brand in the corpus uses this exact color yet. Extract a brand to add one.
Palettes built around it
Fonts for this mood
#21102d reads as cool, dark, luxury. The font library is tagged with the same vocabulary:
mcpConnect your agent — build around #21102d
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 #21102d and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
tool url
/palettes/new/21102d-b89cc4-c0cb62-2d1f2d-eae9f1?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