Color
#181f63
#181f63rgb(24, 31, 99)hsl(234, 61%, 24%)oklch(0.284 0.119 271.8)Colors that go with #181f63
Charcoal, Steel Blue and Amber 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 #181f63: softer than #000 and cool enough to feel like part of the same palette.
Steel Blue #4682b4
analogousshippedSteel Blue is #181f63's neighbour on the wheel, so the two read as one family — use it for hover states, gradients and secondary surfaces.
Amber #ffbf00
shippedAmber is paired with #181f63 in 4 real palettes, including Southwest Airlines's brand system and Beach Hut, as the accent.
Blue #0000ff
shipped6 real palettes, including Monzo's brand system and Sketch's brand system put Blue beside #181f63, as the accent.
Cadet Blue #5f9ea0
shippedDesigners have shipped Cadet Blue with #181f63: 6 real palettes, including SoFi's brand system and Open House, as the supporting colour.
Cobalt Blue #0047ab
shippedDesigners have shipped Cobalt Blue with #181f63: 9 real palettes, including Blue Mono and Purina Pro Plan's brand system, as the lead colour.
Cornflower Blue #6495ed
shippedDesigners have shipped Cornflower Blue with #181f63: 5 real palettes, including Blue Mono and Arctic, as the supporting colour.
Crimson #dc143c
shippedCrimson is paired with #181f63 in 9 real palettes, including Nintendo's brand system and Casper Sleep's brand system, as the supporting colour.
Real palettes that use #181f63
Tints & shades
Harmonies
Contrast
| #181f63 as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 14.84:1 | pass | pass | pass | Passes AAA — no fix needed. |
Aaon black | 1.42:1 | 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 #181f63 as the background.
Brands using this color
Fonts for this mood
#181f63 reads as cool, vivid, dark. 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 #181f63 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
/palettes/new/181f63-9d9cc4-df8a4e-241f2d-e9eef1?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