First Snow
Open in tool →Ice blue on snow-white with a deep navy — the quietest winter palette; everything is a tint of one cold hue.
Color
#21527d
#21527d
hex
#21527drgb
rgb(33, 82, 125)hsl
hsl(208, 58%, 31%)oklch
oklch(0.427 0.089 248.1)Closest name: Assassin (#2d4f83)Relative luminance 0.0784
Colors that go with #21527d
Crimson, Blue and Cadet Blue 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 #21527d — three hues spaced evenly round the wheel, the classic way to get energy into a palette without a clash.
Blue #0000ff
shipped7 real palettes, including CVS's brand system and Tesco's brand system put Blue beside #21527d, as the supporting colour.
Cadet Blue #5f9ea0
shippedDesigners have shipped Cadet Blue with #21527d: 4 real palettes, including Dusk and Open House, as the supporting colour.
Cornflower Blue #6495ed
shippedDesigners have shipped Cornflower Blue with #21527d: 4 real palettes, including Blue Mono and Blizzard's brand system, as the supporting colour.
Denim #1560bd
shippedDesigners have shipped Denim with #21527d: 16 real palettes, including HP's brand system and Dutch Bros's brand system, as the accent.
Firebrick #b22222
shippedDesigners have shipped Firebrick with #21527d: 4 real palettes, including Fireside and Campbell's's brand system, as the lead colour.
Goldenrod #daa520
shippedGoldenrod shows up next to #21527d in 5 real palettes, including Open House and Sapphire & Gold, as the accent.
White Smoke #f5f5f5
neutralWhite Smoke is the surface for #21527d: a clean near-white with no warm cast, so the cool hue stays clear instead of drifting muddy.
Real palettes that use #21527d
Tints & shades
Harmonies
Contrast
| #21527d as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 8.18:1 | pass | pass | pass | Passes AAA — no fix needed. |
Aaon black | 2.57:1 | 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 #21527d 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
#21527d reads as cool, modern. The font library is tagged with the same vocabulary:
mcpConnect your agent — build around #21527d
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 #21527d and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
tool url
/palettes/new/21527d-9cadc4-df4e51-1f212d-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