Color
#181b72
#181b72rgb(24, 27, 114)hsl(238, 65%, 27%)oklch(0.293 0.144 271.7)Colors that go with #181b72
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 #181b72: softer than #000 and cool enough to feel like part of the same palette.
Steel Blue #4682b4
analogousshippedSteel Blue is #181b72'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 Alaska Airlines's brand system put Blue beside #181b72, as the accent.
Cobalt Blue #0047ab
shippedDesigners have shipped Cobalt Blue with #181b72: 6 real palettes, including Purina Pro Plan's brand system and Blue Mono, as the accent.
Crimson #dc143c
shippedCrimson is paired with #181b72 in 5 real palettes, including Nintendo's brand system and Casper Sleep's brand system, as the supporting colour.
Denim #1560bd
shippedDesigners have shipped Denim with #181b72: 11 real palettes, including Bank of America's brand system and Panasonic's brand system, as the accent.
Powder Blue #b0e0e6
shippedDesigners have shipped Powder Blue with #181b72: 4 real palettes, including Glacier and Frost & Ember, as the supporting colour.
Royal Blue #4169e1
shippedRoyal Blue is paired with #181b72 in 8 real palettes, including Discord's brand system and Confluent's brand system, as the lead colour.
Real palettes that use #181b72
Tints & shades
Harmonies
Contrast
| #181b72 as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 14.6:1 | pass | pass | pass | Passes AAA — no fix needed. |
Aaon black | 1.44:1 | 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 #181b72 as the background.
Brands using this color
Fonts for this mood
#181b72 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 #181b72 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
/palettes/new/181b72-9f9cc4-df944e-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