Color
#183a68
#183a68rgb(24, 58, 104)hsl(215, 63%, 25%)oklch(0.35 0.09 256.8)Colors that go with #183a68
Firebrick, Sea Green and Teal 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.
Firebrick #b22222
triadicshippedFirebrick completes a triad with #183a68 — three hues spaced evenly round the wheel, the classic way to get energy into a palette without a clash.
Sea Green #2e8b57
triadicshippedSea Green completes a triad with #183a68 — three hues spaced evenly round the wheel, the classic way to get energy into a palette without a clash.
Teal #008080
analogousshippedTeal is #183a68's neighbour on the wheel, so the two read as one family — use it for hover states, gradients and secondary surfaces.
Blue #0000ff
shipped12 real palettes, including Alaska Airlines's brand system and Jeep's brand system put Blue beside #183a68, as the accent.
Blush Pink #e8b4b8
shipped4 real palettes, including Rain Garden and Garden Wedding put Blush Pink beside #183a68, as the accent.
Cadet Blue #5f9ea0
shippedDesigners have shipped Cadet Blue with #183a68: 6 real palettes, including Open House and Coastal, as the supporting colour.
Cobalt Blue #0047ab
shippedDesigners have shipped Cobalt Blue with #183a68: 4 real palettes, including Purina Pro Plan's brand system and Blue Mono, as the accent.
White Smoke #f5f5f5
neutralWhite Smoke is the surface for #183a68: a clean near-white with no warm cast, so the cool hue stays clear instead of drifting muddy.
Real palettes that use #183a68
Tints & shades
Harmonies
Contrast
| #183a68 as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 11.39:1 | pass | pass | pass | Passes AAA — no fix needed. |
Aaon black | 1.84:1 | 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 #183a68 as the background.
Brands using this color
Fonts for this mood
#183a68 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 #183a68 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
/palettes/new/183a68-9ca8c4-df5d4e-201f2d-e9f0f1?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