Color
#181c63
#181c63rgb(24, 28, 99)hsl(237, 61%, 24%)oklch(0.278 0.122 272.8)Colors that go with #181c63
Charcoal, Steel Blue and 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.
Charcoal #36454f
neutralshippedCharcoal is the text near-black for #181c63: softer than #000 and cool enough to feel like part of the same palette.
Steel Blue #4682b4
analogousshippedSteel Blue is #181c63's neighbour on the wheel, so the two read as one family — use it for hover states, gradients and secondary surfaces.
Blue #0000ff
shipped5 real palettes, including Monzo's brand system and Sketch's brand system put Blue beside #181c63, as the accent.
Cadet Blue #5f9ea0
shippedDesigners have shipped Cadet Blue with #181c63: 6 real palettes, including SoFi's brand system and Open House, as the supporting colour.
Cobalt Blue #0047ab
shippedDesigners have shipped Cobalt Blue with #181c63: 8 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 #181c63: 5 real palettes, including Blue Mono and Arctic, as the supporting colour.
Crimson #dc143c
shippedCrimson is paired with #181c63 in 7 real palettes, including Nintendo's brand system and Casper Sleep's brand system, as the supporting colour.
Deep Sky Blue #00bfff
shippedDesigners have shipped Deep Sky Blue with #181c63: 4 real palettes, including Kraken's brand system and Deep Water, as the accent.
Real palettes that use #181c63
Tints & shades
Harmonies
Contrast
| #181c63 as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 15.16:1 | pass | pass | pass | Passes AAA — no fix needed. |
Aaon black | 1.39:1 | 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 #181c63 as the background.
Brands using this color
Fonts for this mood
#181c63 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 #181c63 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
/palettes/new/181c63-9f9cc4-df924e-251f2d-e9edf1?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