Color
#181b58
#181b58rgb(24, 27, 88)hsl(237, 57%, 22%)oklch(0.265 0.108 274.2)Colors that go with #181b58
Charcoal, Dark Olive Green and Sea Green 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 #181b58: softer than #000 and cool enough to feel like part of the same palette.
Dark Olive Green #556b2f
split-complementshippedDark Olive Green is a split-complement of #181b58: nearly opposite, so it still pops against it, without the vibrating edge of a true complement.
Sea Green #2e8b57
triadicshippedSea Green completes a triad with #181b58 — three hues spaced evenly round the wheel, the classic way to get energy into a palette without a clash.
Steel Blue #4682b4
analogousshippedSteel Blue is #181b58'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 #181b58 in 4 real palettes, including Beach Hut and Blueprint, as the supporting colour.
Blue #0000ff
shipped14 real palettes, including Monzo's brand system and Sketch's brand system put Blue beside #181b58, as the accent.
Cadet Blue #5f9ea0
shippedDesigners have shipped Cadet Blue with #181b58: 9 real palettes, including SoFi's brand system and Open House, as the supporting colour.
Cobalt Blue #0047ab
shippedDesigners have shipped Cobalt Blue with #181b58: 9 real palettes, including Blue Mono and Glacier, as the lead colour.
Real palettes that use #181b58
Tints & shades
Harmonies
Contrast
| #181b58 as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 15.71:1 | pass | pass | pass | Passes AAA — no fix needed. |
Aaon black | 1.34:1 | 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 #181b58 as the background.
Brands using this color
No public brand in the corpus uses this exact color yet. Extract a brand to add one.
Fonts for this mood
#181b58 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 #181b58 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
/palettes/new/181b58-9f9cc4-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