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
#21497d
#21497d
hex
#21497drgb
rgb(33, 73, 125)hsl
hsl(214, 58%, 31%)oklch
oklch(0.405 0.099 256)Closest name: Assassin (#2d4f83)Relative luminance 0.0657
Colors that go with #21497d
Cadet Blue, Crimson and Denim 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.
Cadet Blue #5f9ea0
shippedDesigners have shipped Cadet Blue with #21497d: 4 real palettes, including Dusk and Open House, as the supporting colour.
Crimson #dc143c
shippedCrimson is paired with #21497d in 8 real palettes, including Codecademy's brand system and Marvel's brand system, as the accent.
Denim #1560bd
shippedDesigners have shipped Denim with #21497d: 10 real palettes, including Hinge's brand system and Jack Daniel's's brand system, as the accent.
Midnight Blue #191970
shipped13 real palettes, including First Snow and Microsoft's brand system put Midnight Blue beside #21497d, as that palette's text colour.
Orange Red #ff4500
shippedOrange Red is paired with #21497d in 4 real palettes, including Tumblr's brand system and Tide's brand system, as the accent.
Powder Blue #b0e0e6
shippedDesigners have shipped Powder Blue with #21497d: 6 real palettes, including First Snow and Glacier, as the accent.
White Smoke #f5f5f5
neutralWhite Smoke is the surface for #21497d: a clean near-white with no warm cast, so the cool hue stays clear instead of drifting muddy.
Sienna #a0522d
complementarySienna sits directly opposite #21497d on the wheel — the strongest contrast one hue can give another, so use it small: a button, a link colour, one highlight.
Real palettes that use #21497d
Tints & shades
Harmonies
Contrast
| #21497d as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 9.08:1 | pass | pass | pass | Passes AAA — no fix needed. |
Aaon black | 2.31:1 | 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 #21497d 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
#21497d reads as cool, modern. The font library is tagged with the same vocabulary:
mcpConnect your agent — build around #21497d
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 #21497d and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
tool url
/palettes/new/21497d-9ca9c4-df5a4e-1f1f2d-e9f0f1?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