Frost & Ember
Open in tool →Navy and frost with one ember red — the classic cold-with-a-warm-accent structure, borrowed from a thousand ski posters.
Color
#183b58
#183b58
hex
#183b58rgb
rgb(24, 59, 88)hsl
hsl(207, 57%, 22%)oklch
oklch(0.342 0.065 246.3)Closest name: Maniac Mansion (#004058)Relative luminance 0.0403
Colors that go with #183b58
Crimson, Teal and Sienna 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.
Crimson #dc143c
triadicshippedCrimson completes a triad with #183b58 — three hues spaced evenly round the wheel, the classic way to get energy into a palette without a clash.
Teal #008080
analogousshippedTeal is #183b58's neighbour on the wheel, so the two read as one family — use it for hover states, gradients and secondary surfaces.
Sienna #a0522d
complementaryshippedSienna sits directly opposite #183b58 on the wheel — the strongest contrast one hue can give another, so use it small: a button, a link colour, one highlight.
Amber #ffbf00
shippedAmber is paired with #183b58 in 4 real palettes, including Beach Hut and McDonald's's brand system, as the supporting colour.
Blue #0000ff
shipped13 real palettes, including Alaska Airlines's brand system and Jeep's brand system put Blue beside #183b58, as the accent.
Blush Pink #e8b4b8
shipped5 real palettes, including Rain Garden and Garden Wedding put Blush Pink beside #183b58, as the accent.
Burlywood #deb887
shippedBurlywood is paired with #183b58 in 4 real palettes, including Coastal and Polaroid, as the accent.
White Smoke #f5f5f5
neutralWhite Smoke is the surface for #183b58: a clean near-white with no warm cast, so the cool hue stays clear instead of drifting muddy.
Real palettes that use #183b58
Tints & shades
Harmonies
Contrast
| #183b58 as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 11.63:1 | pass | pass | pass | Passes AAA — no fix needed. |
Aaon black | 1.81:1 | 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 #183b58 as the background.
Brands using this color
No public brand in the corpus uses this exact color yet. Extract a brand to add one.
Palettes built around it
Fonts for this mood
#183b58 reads as cool, dark, luxury. The font library is tagged with the same vocabulary:
mcpConnect your agent — build around #183b58
live endpointPoint 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.
endpoint
https://mcp.brandsweets.com/colors/mcpclaude mcp add --transport http brandsweets-colors https://mcp.brandsweets.com/colors/mcp
try this prompt
›analyze #183b58 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
tool url
/palettes/new/183b58-9cadc4-df4e53-1f212d-e9f1f1?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