Color
#1d366d
#1d366drgb(29, 54, 109)hsl(221, 58%, 27%)oklch(0.346 0.101 263.6)Colors that go with #1d366d
Steel Blue, 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.
Steel Blue #4682b4
analogousshippedSteel Blue is #1d366d's neighbour on the wheel, so the two read as one family — use it for hover states, gradients and secondary surfaces.
Blue #0000ff
shipped10 real palettes, including Alaska Airlines's brand system and CVS's brand system put Blue beside #1d366d, as the accent.
Cadet Blue #5f9ea0
shippedDesigners have shipped Cadet Blue with #1d366d: 5 real palettes, including Open House and Coastal, as the supporting colour.
Cobalt Blue #0047ab
shippedDesigners have shipped Cobalt Blue with #1d366d: 4 real palettes, including Purina Pro Plan's brand system and Blue Mono, as the accent.
Cornflower Blue #6495ed
shippedDesigners have shipped Cornflower Blue with #1d366d: 4 real palettes, including Blue Mono and Blizzard's brand system, as the supporting colour.
Crimson #dc143c
shippedCrimson is paired with #1d366d in 10 real palettes, including Marvel's brand system and Casper Sleep's brand system, as the accent.
Deep Sky Blue #00bfff
shippedDesigners have shipped Deep Sky Blue with #1d366d: 4 real palettes, including Lamborghini's brand system and Kraken's brand system, as the supporting colour.
White Smoke #f5f5f5
neutralWhite Smoke is the surface for #1d366d: a clean near-white with no warm cast, so the cool hue stays clear instead of drifting muddy.
Real palettes that use #1d366d
Tints & shades
Harmonies
Contrast
| #1d366d as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 11.66:1 | pass | pass | pass | Passes AAA — no fix needed. |
Aaon black | 1.8:1 | 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 #1d366d as the background.
Brands using this color
Fonts for this mood
#1d366d 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 #1d366d and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
/palettes/new/1d366d-9ca4c4-df6b4e-211f2d-e9eff1?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